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Finding the Fourth Proportional to 372.82, 559.15 and 129.42

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Solution

The fourth proportional to 372.82, 559.15 and 129.42 is: 194.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.82 : 559.15 = 129.42 : x
  2. Step 2: Convert to fraction form
    372.82/559.15 = 129.42/x
  3. Step 3: Cross multiply
    372.82x = 559.15 × 129.42
  4. Step 4: Simplify right side
    372.82x = 72,362.40
  5. Step 5: Solve for x
    x = 72,362.40/372.82
  6. Step 6: Final answer
    x = 194.09

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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.