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Finding the Fourth Proportional to 747.91, 1,121.32 and 382.42

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Solution

The fourth proportional to 747.91, 1,121.32 and 382.42 is: 573.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    747.91 : 1,121.32 = 382.42 : x
  2. Step 2: Convert to fraction form
    747.91/1,121.32 = 382.42/x
  3. Step 3: Cross multiply
    747.91x = 1,121.32 × 382.42
  4. Step 4: Simplify right side
    747.91x = 428,815.19
  5. Step 5: Solve for x
    x = 428,815.19/747.91
  6. Step 6: Final answer
    x = 573.35

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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.