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Finding the Fourth Proportional to 92.08, 137.96 and 79.28

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Solution

The fourth proportional to 92.08, 137.96 and 79.28 is: 118.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.08 : 137.96 = 79.28 : x
  2. Step 2: Convert to fraction form
    92.08/137.96 = 79.28/x
  3. Step 3: Cross multiply
    92.08x = 137.96 × 79.28
  4. Step 4: Simplify right side
    92.08x = 10,937.47
  5. Step 5: Solve for x
    x = 10,937.47/92.08
  6. Step 6: Final answer
    x = 118.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.