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Finding the Fourth Proportional to 202.61, 279.72 and 137.21

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Solution

The fourth proportional to 202.61, 279.72 and 137.21 is: 189.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.61 : 279.72 = 137.21 : x
  2. Step 2: Convert to fraction form
    202.61/279.72 = 137.21/x
  3. Step 3: Cross multiply
    202.61x = 279.72 × 137.21
  4. Step 4: Simplify right side
    202.61x = 38,380.38
  5. Step 5: Solve for x
    x = 38,380.38/202.61
  6. Step 6: Final answer
    x = 189.43

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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.