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Finding the Fourth Proportional to 94.21, 129.17 and 94.06

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Solution

The fourth proportional to 94.21, 129.17 and 94.06 is: 128.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.21 : 129.17 = 94.06 : x
  2. Step 2: Convert to fraction form
    94.21/129.17 = 94.06/x
  3. Step 3: Cross multiply
    94.21x = 129.17 × 94.06
  4. Step 4: Simplify right side
    94.21x = 12,149.86
  5. Step 5: Solve for x
    x = 12,149.86/94.21
  6. Step 6: Final answer
    x = 128.96

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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.