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Finding the Fourth Proportional to 94.14, 129.90 and 68.28

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Solution

The fourth proportional to 94.14, 129.90 and 68.28 is: 94.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.14 : 129.90 = 68.28 : x
  2. Step 2: Convert to fraction form
    94.14/129.90 = 68.28/x
  3. Step 3: Cross multiply
    94.14x = 129.90 × 68.28
  4. Step 4: Simplify right side
    94.14x = 8,869.57
  5. Step 5: Solve for x
    x = 8,869.57/94.14
  6. Step 6: Final answer
    x = 94.22

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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.