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Finding the Fourth Proportional to 489.72, 732.97 and 315.95

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Solution

The fourth proportional to 489.72, 732.97 and 315.95 is: 472.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    489.72 : 732.97 = 315.95 : x
  2. Step 2: Convert to fraction form
    489.72/732.97 = 315.95/x
  3. Step 3: Cross multiply
    489.72x = 732.97 × 315.95
  4. Step 4: Simplify right side
    489.72x = 231,577.42
  5. Step 5: Solve for x
    x = 231,577.42/489.72
  6. Step 6: Final answer
    x = 472.88

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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.