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Finding the Fourth Proportional to 251.49, 376.97 and 86.91

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Solution

The fourth proportional to 251.49, 376.97 and 86.91 is: 130.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.49 : 376.97 = 86.91 : x
  2. Step 2: Convert to fraction form
    251.49/376.97 = 86.91/x
  3. Step 3: Cross multiply
    251.49x = 376.97 × 86.91
  4. Step 4: Simplify right side
    251.49x = 32,761.52
  5. Step 5: Solve for x
    x = 32,761.52/251.49
  6. Step 6: Final answer
    x = 130.27

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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.