Home / 1,224,128.76-1,689,340.20-680,287.47

Finding the Fourth Proportional to 1,224,128.76, 1,689,340.20 and 680,287.47

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Solution

The fourth proportional to 1,224,128.76, 1,689,340.20 and 680,287.47 is: 938,820.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224,128.76 : 1,689,340.20 = 680,287.47 : x
  2. Step 2: Convert to fraction form
    1,224,128.76/1,689,340.20 = 680,287.47/x
  3. Step 3: Cross multiply
    1,224,128.76x = 1,689,340.20 × 680,287.47
  4. Step 4: Simplify right side
    1,224,128.76x = 1,149,236,970,627.29
  5. Step 5: Solve for x
    x = 1,149,236,970,627.29/1,224,128.76
  6. Step 6: Final answer
    x = 938,820.33

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Half scale
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Double scale
Find fourth proportional to 1,224,129.76, 1,689,341.58 and 680,288.47
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.