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Finding the Fourth Proportional to 781.01, 1,170.29 and 627.92

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Solution

The fourth proportional to 781.01, 1,170.29 and 627.92 is: 940.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.01 : 1,170.29 = 627.92 : x
  2. Step 2: Convert to fraction form
    781.01/1,170.29 = 627.92/x
  3. Step 3: Cross multiply
    781.01x = 1,170.29 × 627.92
  4. Step 4: Simplify right side
    781.01x = 734,848.50
  5. Step 5: Solve for x
    x = 734,848.50/781.01
  6. Step 6: Final answer
    x = 940.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.