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Finding the Fourth Proportional to 781.62, 1,079.28 and 627.06

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Solution

The fourth proportional to 781.62, 1,079.28 and 627.06 is: 865.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.62 : 1,079.28 = 627.06 : x
  2. Step 2: Convert to fraction form
    781.62/1,079.28 = 627.06/x
  3. Step 3: Cross multiply
    781.62x = 1,079.28 × 627.06
  4. Step 4: Simplify right side
    781.62x = 676,773.32
  5. Step 5: Solve for x
    x = 676,773.32/781.62
  6. Step 6: Final answer
    x = 865.86

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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.