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Finding the Fourth Proportional to 82.57, 123.71 and 58.15

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Solution

The fourth proportional to 82.57, 123.71 and 58.15 is: 87.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    82.57 : 123.71 = 58.15 : x
  2. Step 2: Convert to fraction form
    82.57/123.71 = 58.15/x
  3. Step 3: Cross multiply
    82.57x = 123.71 × 58.15
  4. Step 4: Simplify right side
    82.57x = 7,193.93
  5. Step 5: Solve for x
    x = 7,193.93/82.57
  6. Step 6: Final answer
    x = 87.13

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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.