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Finding the Fourth Proportional to 251.32, 377.30 and 129.72

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Solution

The fourth proportional to 251.32, 377.30 and 129.72 is: 194.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.32 : 377.30 = 129.72 : x
  2. Step 2: Convert to fraction form
    251.32/377.30 = 129.72/x
  3. Step 3: Cross multiply
    251.32x = 377.30 × 129.72
  4. Step 4: Simplify right side
    251.32x = 48,943.36
  5. Step 5: Solve for x
    x = 48,943.36/251.32
  6. Step 6: Final answer
    x = 194.75

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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.