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Finding the Fourth Proportional to 94.29, 129.28 and 85.04

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Solution

The fourth proportional to 94.29, 129.28 and 85.04 is: 116.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.29 : 129.28 = 85.04 : x
  2. Step 2: Convert to fraction form
    94.29/129.28 = 85.04/x
  3. Step 3: Cross multiply
    94.29x = 129.28 × 85.04
  4. Step 4: Simplify right side
    94.29x = 10,993.32
  5. Step 5: Solve for x
    x = 10,993.32/94.29
  6. Step 6: Final answer
    x = 116.60

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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.