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Finding the Fourth Proportional to 83.98, 125.75 and 61.13

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Solution

The fourth proportional to 83.98, 125.75 and 61.13 is: 91.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.98 : 125.75 = 61.13 : x
  2. Step 2: Convert to fraction form
    83.98/125.75 = 61.13/x
  3. Step 3: Cross multiply
    83.98x = 125.75 × 61.13
  4. Step 4: Simplify right side
    83.98x = 7,687.56
  5. Step 5: Solve for x
    x = 7,687.56/83.98
  6. Step 6: Final answer
    x = 91.54

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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.