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Finding the Fourth Proportional to 94.86, 129.78 and 94.32

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Solution

The fourth proportional to 94.86, 129.78 and 94.32 is: 129.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.86 : 129.78 = 94.32 : x
  2. Step 2: Convert to fraction form
    94.86/129.78 = 94.32/x
  3. Step 3: Cross multiply
    94.86x = 129.78 × 94.32
  4. Step 4: Simplify right side
    94.86x = 12,240.85
  5. Step 5: Solve for x
    x = 12,240.85/94.86
  6. Step 6: Final answer
    x = 129.04

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.