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Finding the Fourth Proportional to 1,220.76, 1,684.80 and 755.10

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Solution

The fourth proportional to 1,220.76, 1,684.80 and 755.10 is: 1,042.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.76 : 1,684.80 = 755.10 : x
  2. Step 2: Convert to fraction form
    1,220.76/1,684.80 = 755.10/x
  3. Step 3: Cross multiply
    1,220.76x = 1,684.80 × 755.10
  4. Step 4: Simplify right side
    1,220.76x = 1,272,192.48
  5. Step 5: Solve for x
    x = 1,272,192.48/1,220.76
  6. Step 6: Final answer
    x = 1,042.13

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Find fourth proportional to 610.38, 842.40 and 377.55
Half scale
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Double scale
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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.