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Finding the Fourth Proportional to 747.81, 1,120.17 and 438.73

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Solution

The fourth proportional to 747.81, 1,120.17 and 438.73 is: 657.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.81 : 1,120.17 = 438.73 : x
  2. Step 2: Convert to fraction form
    747.81/1,120.17 = 438.73/x
  3. Step 3: Cross multiply
    747.81x = 1,120.17 × 438.73
  4. Step 4: Simplify right side
    747.81x = 491,449.38
  5. Step 5: Solve for x
    x = 491,449.38/747.81
  6. Step 6: Final answer
    x = 657.18

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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.