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Finding the Fourth Proportional to 82.49, 123.73 and 39.15

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Solution

The fourth proportional to 82.49, 123.73 and 39.15 is: 58.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.49 : 123.73 = 39.15 : x
  2. Step 2: Convert to fraction form
    82.49/123.73 = 39.15/x
  3. Step 3: Cross multiply
    82.49x = 123.73 × 39.15
  4. Step 4: Simplify right side
    82.49x = 4,843.93
  5. Step 5: Solve for x
    x = 4,843.93/82.49
  6. Step 6: Final answer
    x = 58.73

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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.