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Finding the Fourth Proportional to 747.20, 1,121.20 and 516.76

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Solution

The fourth proportional to 747.20, 1,121.20 and 516.76 is: 775.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.20 : 1,121.20 = 516.76 : x
  2. Step 2: Convert to fraction form
    747.20/1,121.20 = 516.76/x
  3. Step 3: Cross multiply
    747.20x = 1,121.20 × 516.76
  4. Step 4: Simplify right side
    747.20x = 579,391.31
  5. Step 5: Solve for x
    x = 579,391.31/747.20
  6. Step 6: Final answer
    x = 775.42

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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.