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Finding the Fourth Proportional to 202.38, 279.19 and 124.80

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Solution

The fourth proportional to 202.38, 279.19 and 124.80 is: 172.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.38 : 279.19 = 124.80 : x
  2. Step 2: Convert to fraction form
    202.38/279.19 = 124.80/x
  3. Step 3: Cross multiply
    202.38x = 279.19 × 124.80
  4. Step 4: Simplify right side
    202.38x = 34,842.91
  5. Step 5: Solve for x
    x = 34,842.91/202.38
  6. Step 6: Final answer
    x = 172.17

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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.