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Finding the Fourth Proportional to 747.28, 1,121.36 and 382.40

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Solution

The fourth proportional to 747.28, 1,121.36 and 382.40 is: 573.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.28 : 1,121.36 = 382.40 : x
  2. Step 2: Convert to fraction form
    747.28/1,121.36 = 382.40/x
  3. Step 3: Cross multiply
    747.28x = 1,121.36 × 382.40
  4. Step 4: Simplify right side
    747.28x = 428,808.06
  5. Step 5: Solve for x
    x = 428,808.06/747.28
  6. Step 6: Final answer
    x = 573.83

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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.