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Finding the Fourth Proportional to 747.12, 1,121.73 and 382.17

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Solution

The fourth proportional to 747.12, 1,121.73 and 382.17 is: 573.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.12 : 1,121.73 = 382.17 : x
  2. Step 2: Convert to fraction form
    747.12/1,121.73 = 382.17/x
  3. Step 3: Cross multiply
    747.12x = 1,121.73 × 382.17
  4. Step 4: Simplify right side
    747.12x = 428,691.55
  5. Step 5: Solve for x
    x = 428,691.55/747.12
  6. Step 6: Final answer
    x = 573.79

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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.