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Finding the Fourth Proportional to 209.58, 289.26 and 126.71

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Solution

The fourth proportional to 209.58, 289.26 and 126.71 is: 174.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.58 : 289.26 = 126.71 : x
  2. Step 2: Convert to fraction form
    209.58/289.26 = 126.71/x
  3. Step 3: Cross multiply
    209.58x = 289.26 × 126.71
  4. Step 4: Simplify right side
    209.58x = 36,651.50
  5. Step 5: Solve for x
    x = 36,651.50/209.58
  6. Step 6: Final answer
    x = 174.88

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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.