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Finding the Fourth Proportional to 83.90, 115.84 and 63.38

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Solution

The fourth proportional to 83.90, 115.84 and 63.38 is: 87.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.90 : 115.84 = 63.38 : x
  2. Step 2: Convert to fraction form
    83.90/115.84 = 63.38/x
  3. Step 3: Cross multiply
    83.90x = 115.84 × 63.38
  4. Step 4: Simplify right side
    83.90x = 7,341.94
  5. Step 5: Solve for x
    x = 7,341.94/83.90
  6. Step 6: Final answer
    x = 87.51

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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.