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Finding the Fourth Proportional to 1,224.76, 1,688.60 and 781.92

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Solution

The fourth proportional to 1,224.76, 1,688.60 and 781.92 is: 1,078.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.76 : 1,688.60 = 781.92 : x
  2. Step 2: Convert to fraction form
    1,224.76/1,688.60 = 781.92/x
  3. Step 3: Cross multiply
    1,224.76x = 1,688.60 × 781.92
  4. Step 4: Simplify right side
    1,224.76x = 1,320,350.11
  5. Step 5: Solve for x
    x = 1,320,350.11/1,224.76
  6. Step 6: Final answer
    x = 1,078.05

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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.