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Finding the Fourth Proportional to 83.72, 115.20 and 66.98

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Solution

The fourth proportional to 83.72, 115.20 and 66.98 is: 92.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.72 : 115.20 = 66.98 : x
  2. Step 2: Convert to fraction form
    83.72/115.20 = 66.98/x
  3. Step 3: Cross multiply
    83.72x = 115.20 × 66.98
  4. Step 4: Simplify right side
    83.72x = 7,716.10
  5. Step 5: Solve for x
    x = 7,716.10/83.72
  6. Step 6: Final answer
    x = 92.17

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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.