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Finding the Fourth Proportional to 372.87, 559.56 and 129.40

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Solution

The fourth proportional to 372.87, 559.56 and 129.40 is: 194.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.87 : 559.56 = 129.40 : x
  2. Step 2: Convert to fraction form
    372.87/559.56 = 129.40/x
  3. Step 3: Cross multiply
    372.87x = 559.56 × 129.40
  4. Step 4: Simplify right side
    372.87x = 72,406.36
  5. Step 5: Solve for x
    x = 72,406.36/372.87
  6. Step 6: Final answer
    x = 194.19

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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.