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Finding the Fourth Proportional to 83.85, 115.74 and 59.30

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Solution

The fourth proportional to 83.85, 115.74 and 59.30 is: 81.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.85 : 115.74 = 59.30 : x
  2. Step 2: Convert to fraction form
    83.85/115.74 = 59.30/x
  3. Step 3: Cross multiply
    83.85x = 115.74 × 59.30
  4. Step 4: Simplify right side
    83.85x = 6,863.38
  5. Step 5: Solve for x
    x = 6,863.38/83.85
  6. Step 6: Final answer
    x = 81.85

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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.