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Finding the Fourth Proportional to 84.11, 126.39 and 61.31

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Solution

The fourth proportional to 84.11, 126.39 and 61.31 is: 92.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.11 : 126.39 = 61.31 : x
  2. Step 2: Convert to fraction form
    84.11/126.39 = 61.31/x
  3. Step 3: Cross multiply
    84.11x = 126.39 × 61.31
  4. Step 4: Simplify right side
    84.11x = 7,748.34
  5. Step 5: Solve for x
    x = 7,748.34/84.11
  6. Step 6: Final answer
    x = 92.13

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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.