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Finding the Fourth Proportional to 84.92, 127.29 and 39.30

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Solution

The fourth proportional to 84.92, 127.29 and 39.30 is: 58.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.92 : 127.29 = 39.30 : x
  2. Step 2: Convert to fraction form
    84.92/127.29 = 39.30/x
  3. Step 3: Cross multiply
    84.92x = 127.29 × 39.30
  4. Step 4: Simplify right side
    84.92x = 5,002.21
  5. Step 5: Solve for x
    x = 5,002.21/84.92
  6. Step 6: Final answer
    x = 58.91

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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.