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Finding the Fourth Proportional to 202.39, 279.30 and 124.75

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Solution

The fourth proportional to 202.39, 279.30 and 124.75 is: 172.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    202.39 : 279.30 = 124.75 : x
  2. Step 2: Convert to fraction form
    202.39/279.30 = 124.75/x
  3. Step 3: Cross multiply
    202.39x = 279.30 × 124.75
  4. Step 4: Simplify right side
    202.39x = 34,842.68
  5. Step 5: Solve for x
    x = 34,842.68/202.39
  6. Step 6: Final answer
    x = 172.16

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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.