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Finding the Fourth Proportional to 83.13, 123.84 and 79.63

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Solution

The fourth proportional to 83.13, 123.84 and 79.63 is: 118.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.13 : 123.84 = 79.63 : x
  2. Step 2: Convert to fraction form
    83.13/123.84 = 79.63/x
  3. Step 3: Cross multiply
    83.13x = 123.84 × 79.63
  4. Step 4: Simplify right side
    83.13x = 9,861.38
  5. Step 5: Solve for x
    x = 9,861.38/83.13
  6. Step 6: Final answer
    x = 118.63

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.