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Finding the Fourth Proportional to 94.07, 129.79 and 81.77

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Solution

The fourth proportional to 94.07, 129.79 and 81.77 is: 112.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.07 : 129.79 = 81.77 : x
  2. Step 2: Convert to fraction form
    94.07/129.79 = 81.77/x
  3. Step 3: Cross multiply
    94.07x = 129.79 × 81.77
  4. Step 4: Simplify right side
    94.07x = 10,612.07
  5. Step 5: Solve for x
    x = 10,612.07/94.07
  6. Step 6: Final answer
    x = 112.82

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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.