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Finding the Fourth Proportional to 83.02, 123.91 and 77.38

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Solution

The fourth proportional to 83.02, 123.91 and 77.38 is: 115.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    83.02 : 123.91 = 77.38 : x
  2. Step 2: Convert to fraction form
    83.02/123.91 = 77.38/x
  3. Step 3: Cross multiply
    83.02x = 123.91 × 77.38
  4. Step 4: Simplify right side
    83.02x = 9,588.16
  5. Step 5: Solve for x
    x = 9,588.16/83.02
  6. Step 6: Final answer
    x = 115.49

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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.