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Finding the Fourth Proportional to 83.98, 115.75 and 66.46

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Solution

The fourth proportional to 83.98, 115.75 and 66.46 is: 91.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.98 : 115.75 = 66.46 : x
  2. Step 2: Convert to fraction form
    83.98/115.75 = 66.46/x
  3. Step 3: Cross multiply
    83.98x = 115.75 × 66.46
  4. Step 4: Simplify right side
    83.98x = 7,692.75
  5. Step 5: Solve for x
    x = 7,692.75/83.98
  6. Step 6: Final answer
    x = 91.60

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.