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Finding the Fourth Proportional to 129.87, 194.94 and 125.28

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Solution

The fourth proportional to 129.87, 194.94 and 125.28 is: 188.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.87 : 194.94 = 125.28 : x
  2. Step 2: Convert to fraction form
    129.87/194.94 = 125.28/x
  3. Step 3: Cross multiply
    129.87x = 194.94 × 125.28
  4. Step 4: Simplify right side
    129.87x = 24,422.08
  5. Step 5: Solve for x
    x = 24,422.08/129.87
  6. Step 6: Final answer
    x = 188.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.