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Finding the Fourth Proportional to 372.89, 559.39 and 129.39

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Solution

The fourth proportional to 372.89, 559.39 and 129.39 is: 194.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.89 : 559.39 = 129.39 : x
  2. Step 2: Convert to fraction form
    372.89/559.39 = 129.39/x
  3. Step 3: Cross multiply
    372.89x = 559.39 × 129.39
  4. Step 4: Simplify right side
    372.89x = 72,379.47
  5. Step 5: Solve for x
    x = 72,379.47/372.89
  6. Step 6: Final answer
    x = 194.10

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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.