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Finding the Fourth Proportional to 360.56, 540.87 and 129.47

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Solution

The fourth proportional to 360.56, 540.87 and 129.47 is: 194.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    360.56 : 540.87 = 129.47 : x
  2. Step 2: Convert to fraction form
    360.56/540.87 = 129.47/x
  3. Step 3: Cross multiply
    360.56x = 540.87 × 129.47
  4. Step 4: Simplify right side
    360.56x = 70,023.73
  5. Step 5: Solve for x
    x = 70,023.73/360.56
  6. Step 6: Final answer
    x = 194.21

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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.