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Finding the Fourth Proportional to 99.71, 149.21 and 82.43

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Solution

The fourth proportional to 99.71, 149.21 and 82.43 is: 123.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.71 : 149.21 = 82.43 : x
  2. Step 2: Convert to fraction form
    99.71/149.21 = 82.43/x
  3. Step 3: Cross multiply
    99.71x = 149.21 × 82.43
  4. Step 4: Simplify right side
    99.71x = 12,298.97
  5. Step 5: Solve for x
    x = 12,298.97/99.71
  6. Step 6: Final answer
    x = 123.35

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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.