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Finding the Fourth Proportional to 249.72, 374.34 and 87.30

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Solution

The fourth proportional to 249.72, 374.34 and 87.30 is: 130.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.72 : 374.34 = 87.30 : x
  2. Step 2: Convert to fraction form
    249.72/374.34 = 87.30/x
  3. Step 3: Cross multiply
    249.72x = 374.34 × 87.30
  4. Step 4: Simplify right side
    249.72x = 32,679.88
  5. Step 5: Solve for x
    x = 32,679.88/249.72
  6. Step 6: Final answer
    x = 130.87

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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.