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Finding the Fourth Proportional to 84.86, 127.19 and 39.11

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Solution

The fourth proportional to 84.86, 127.19 and 39.11 is: 58.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.86 : 127.19 = 39.11 : x
  2. Step 2: Convert to fraction form
    84.86/127.19 = 39.11/x
  3. Step 3: Cross multiply
    84.86x = 127.19 × 39.11
  4. Step 4: Simplify right side
    84.86x = 4,974.35
  5. Step 5: Solve for x
    x = 4,974.35/84.86
  6. Step 6: Final answer
    x = 58.62

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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.