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Finding the Fourth Proportional to 99.92, 149.90 and 31.43

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Solution

The fourth proportional to 99.92, 149.90 and 31.43 is: 47.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.92 : 149.90 = 31.43 : x
  2. Step 2: Convert to fraction form
    99.92/149.90 = 31.43/x
  3. Step 3: Cross multiply
    99.92x = 149.90 × 31.43
  4. Step 4: Simplify right side
    99.92x = 4,710.73
  5. Step 5: Solve for x
    x = 4,710.73/99.92
  6. Step 6: Final answer
    x = 47.14

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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.