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Finding the Fourth Proportional to 249.55, 374.21 and 138.29

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Solution

The fourth proportional to 249.55, 374.21 and 138.29 is: 207.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    249.55 : 374.21 = 138.29 : x
  2. Step 2: Convert to fraction form
    249.55/374.21 = 138.29/x
  3. Step 3: Cross multiply
    249.55x = 374.21 × 138.29
  4. Step 4: Simplify right side
    249.55x = 51,750.44
  5. Step 5: Solve for x
    x = 51,750.44/249.55
  6. Step 6: Final answer
    x = 207.38

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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.