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Finding the Fourth Proportional to 202.72, 279.92 and 137.44

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Solution

The fourth proportional to 202.72, 279.92 and 137.44 is: 189.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.72 : 279.92 = 137.44 : x
  2. Step 2: Convert to fraction form
    202.72/279.92 = 137.44/x
  3. Step 3: Cross multiply
    202.72x = 279.92 × 137.44
  4. Step 4: Simplify right side
    202.72x = 38,472.20
  5. Step 5: Solve for x
    x = 38,472.20/202.72
  6. Step 6: Final answer
    x = 189.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.