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Finding the Fourth Proportional to 84.57, 126.82 and 38.91

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Solution

The fourth proportional to 84.57, 126.82 and 38.91 is: 58.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.57 : 126.82 = 38.91 : x
  2. Step 2: Convert to fraction form
    84.57/126.82 = 38.91/x
  3. Step 3: Cross multiply
    84.57x = 126.82 × 38.91
  4. Step 4: Simplify right side
    84.57x = 4,934.57
  5. Step 5: Solve for x
    x = 4,934.57/84.57
  6. Step 6: Final answer
    x = 58.35

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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.