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Finding the Fourth Proportional to 1,039.92, 1,565.15 and 781.32

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Solution

The fourth proportional to 1,039.92, 1,565.15 and 781.32 is: 1,175.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.92 : 1,565.15 = 781.32 : x
  2. Step 2: Convert to fraction form
    1,039.92/1,565.15 = 781.32/x
  3. Step 3: Cross multiply
    1,039.92x = 1,565.15 × 781.32
  4. Step 4: Simplify right side
    1,039.92x = 1,222,883.00
  5. Step 5: Solve for x
    x = 1,222,883.00/1,039.92
  6. Step 6: Final answer
    x = 1,175.94

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.