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Finding the Fourth Proportional to 209.53, 288.98 and 126.55

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Solution

The fourth proportional to 209.53, 288.98 and 126.55 is: 174.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.53 : 288.98 = 126.55 : x
  2. Step 2: Convert to fraction form
    209.53/288.98 = 126.55/x
  3. Step 3: Cross multiply
    209.53x = 288.98 × 126.55
  4. Step 4: Simplify right side
    209.53x = 36,568.97
  5. Step 5: Solve for x
    x = 36,568.97/209.53
  6. Step 6: Final answer
    x = 174.53

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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.