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Finding the Fourth Proportional to 251.49, 377.12 and 129.72

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Solution

The fourth proportional to 251.49, 377.12 and 129.72 is: 194.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.49 : 377.12 = 129.72 : x
  2. Step 2: Convert to fraction form
    251.49/377.12 = 129.72/x
  3. Step 3: Cross multiply
    251.49x = 377.12 × 129.72
  4. Step 4: Simplify right side
    251.49x = 48,919.36
  5. Step 5: Solve for x
    x = 48,919.36/251.49
  6. Step 6: Final answer
    x = 194.52

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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.