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Finding the Fourth Proportional to 981.38, 1,472.05 and 396.53

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Solution

The fourth proportional to 981.38, 1,472.05 and 396.53 is: 594.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    981.38 : 1,472.05 = 396.53 : x
  2. Step 2: Convert to fraction form
    981.38/1,472.05 = 396.53/x
  3. Step 3: Cross multiply
    981.38x = 1,472.05 × 396.53
  4. Step 4: Simplify right side
    981.38x = 583,711.99
  5. Step 5: Solve for x
    x = 583,711.99/981.38
  6. Step 6: Final answer
    x = 594.79

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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.