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Finding the Fourth Proportional to 251.91, 377.87 and 128.59

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Solution

The fourth proportional to 251.91, 377.87 and 128.59 is: 192.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.91 : 377.87 = 128.59 : x
  2. Step 2: Convert to fraction form
    251.91/377.87 = 128.59/x
  3. Step 3: Cross multiply
    251.91x = 377.87 × 128.59
  4. Step 4: Simplify right side
    251.91x = 48,588.72
  5. Step 5: Solve for x
    x = 48,588.72/251.91
  6. Step 6: Final answer
    x = 192.88

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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.