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Finding the Fourth Proportional to 94.44, 129.96 and 79.86

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Solution

The fourth proportional to 94.44, 129.96 and 79.86 is: 109.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.44 : 129.96 = 79.86 : x
  2. Step 2: Convert to fraction form
    94.44/129.96 = 79.86/x
  3. Step 3: Cross multiply
    94.44x = 129.96 × 79.86
  4. Step 4: Simplify right side
    94.44x = 10,378.61
  5. Step 5: Solve for x
    x = 10,378.61/94.44
  6. Step 6: Final answer
    x = 109.90

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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.