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Finding the Fourth Proportional to 99.38, 137.14 and 57.92

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Solution

The fourth proportional to 99.38, 137.14 and 57.92 is: 79.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.38 : 137.14 = 57.92 : x
  2. Step 2: Convert to fraction form
    99.38/137.14 = 57.92/x
  3. Step 3: Cross multiply
    99.38x = 137.14 × 57.92
  4. Step 4: Simplify right side
    99.38x = 7,943.15
  5. Step 5: Solve for x
    x = 7,943.15/99.38
  6. Step 6: Final answer
    x = 79.93

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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.