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Finding the Fourth Proportional to 251.45, 377.42 and 129.80

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Solution

The fourth proportional to 251.45, 377.42 and 129.80 is: 194.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.45 : 377.42 = 129.80 : x
  2. Step 2: Convert to fraction form
    251.45/377.42 = 129.80/x
  3. Step 3: Cross multiply
    251.45x = 377.42 × 129.80
  4. Step 4: Simplify right side
    251.45x = 48,987.55
  5. Step 5: Solve for x
    x = 48,987.55/251.45
  6. Step 6: Final answer
    x = 194.82

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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.