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Finding the Fourth Proportional to 83.67, 115.40 and 50.91

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Solution

The fourth proportional to 83.67, 115.40 and 50.91 is: 70.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.67 : 115.40 = 50.91 : x
  2. Step 2: Convert to fraction form
    83.67/115.40 = 50.91/x
  3. Step 3: Cross multiply
    83.67x = 115.40 × 50.91
  4. Step 4: Simplify right side
    83.67x = 5,874.76
  5. Step 5: Solve for x
    x = 5,874.76/83.67
  6. Step 6: Final answer
    x = 70.21

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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.