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Finding the Fourth Proportional to 757.52, 1,134.45 and 431.90

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Solution

The fourth proportional to 757.52, 1,134.45 and 431.90 is: 646.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.52 : 1,134.45 = 431.90 : x
  2. Step 2: Convert to fraction form
    757.52/1,134.45 = 431.90/x
  3. Step 3: Cross multiply
    757.52x = 1,134.45 × 431.90
  4. Step 4: Simplify right side
    757.52x = 489,963.28
  5. Step 5: Solve for x
    x = 489,963.28/757.52
  6. Step 6: Final answer
    x = 646.80

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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.