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Finding the Fourth Proportional to 129.72, 193.66 and 125.22

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Solution

The fourth proportional to 129.72, 193.66 and 125.22 is: 186.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.72 : 193.66 = 125.22 : x
  2. Step 2: Convert to fraction form
    129.72/193.66 = 125.22/x
  3. Step 3: Cross multiply
    129.72x = 193.66 × 125.22
  4. Step 4: Simplify right side
    129.72x = 24,250.11
  5. Step 5: Solve for x
    x = 24,250.11/129.72
  6. Step 6: Final answer
    x = 186.94

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.