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Finding the Fourth Proportional to 82.14, 123.17 and 47.92

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Solution

The fourth proportional to 82.14, 123.17 and 47.92 is: 71.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.14 : 123.17 = 47.92 : x
  2. Step 2: Convert to fraction form
    82.14/123.17 = 47.92/x
  3. Step 3: Cross multiply
    82.14x = 123.17 × 47.92
  4. Step 4: Simplify right side
    82.14x = 5,901.91
  5. Step 5: Solve for x
    x = 5,901.91/82.14
  6. Step 6: Final answer
    x = 71.85

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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.