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Finding the Fourth Proportional to 209.42, 289.13 and 126.53

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Solution

The fourth proportional to 209.42, 289.13 and 126.53 is: 174.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.42 : 289.13 = 126.53 : x
  2. Step 2: Convert to fraction form
    209.42/289.13 = 126.53/x
  3. Step 3: Cross multiply
    209.42x = 289.13 × 126.53
  4. Step 4: Simplify right side
    209.42x = 36,581.54
  5. Step 5: Solve for x
    x = 36,581.54/209.42
  6. Step 6: Final answer
    x = 174.68

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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.