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Finding the Fourth Proportional to 615.18, 921.72 and 431.73

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Solution

The fourth proportional to 615.18, 921.72 and 431.73 is: 646.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.18 : 921.72 = 431.73 : x
  2. Step 2: Convert to fraction form
    615.18/921.72 = 431.73/x
  3. Step 3: Cross multiply
    615.18x = 921.72 × 431.73
  4. Step 4: Simplify right side
    615.18x = 397,934.18
  5. Step 5: Solve for x
    x = 397,934.18/615.18
  6. Step 6: Final answer
    x = 646.86

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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.