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Finding the Fourth Proportional to 209.46, 313.42 and 126.90

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Solution

The fourth proportional to 209.46, 313.42 and 126.90 is: 189.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    209.46 : 313.42 = 126.90 : x
  2. Step 2: Convert to fraction form
    209.46/313.42 = 126.90/x
  3. Step 3: Cross multiply
    209.46x = 313.42 × 126.90
  4. Step 4: Simplify right side
    209.46x = 39,773.00
  5. Step 5: Solve for x
    x = 39,773.00/209.46
  6. Step 6: Final answer
    x = 189.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.