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Finding the Fourth Proportional to 129.24, 194.79 and 123.75

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Solution

The fourth proportional to 129.24, 194.79 and 123.75 is: 186.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    129.24 : 194.79 = 123.75 : x
  2. Step 2: Convert to fraction form
    129.24/194.79 = 123.75/x
  3. Step 3: Cross multiply
    129.24x = 194.79 × 123.75
  4. Step 4: Simplify right side
    129.24x = 24,105.26
  5. Step 5: Solve for x
    x = 24,105.26/129.24
  6. Step 6: Final answer
    x = 186.52

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.