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Finding the Fourth Proportional to 92.49, 139.25 and 81.15

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Solution

The fourth proportional to 92.49, 139.25 and 81.15 is: 122.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.49 : 139.25 = 81.15 : x
  2. Step 2: Convert to fraction form
    92.49/139.25 = 81.15/x
  3. Step 3: Cross multiply
    92.49x = 139.25 × 81.15
  4. Step 4: Simplify right side
    92.49x = 11,299.73
  5. Step 5: Solve for x
    x = 11,299.73/92.49
  6. Step 6: Final answer
    x = 122.17

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.