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Finding the Fourth Proportional to 94.24, 129.80 and 81.28

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Solution

The fourth proportional to 94.24, 129.80 and 81.28 is: 111.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.24 : 129.80 = 81.28 : x
  2. Step 2: Convert to fraction form
    94.24/129.80 = 81.28/x
  3. Step 3: Cross multiply
    94.24x = 129.80 × 81.28
  4. Step 4: Simplify right side
    94.24x = 10,550.14
  5. Step 5: Solve for x
    x = 10,550.14/94.24
  6. Step 6: Final answer
    x = 111.95

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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.