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Finding the Fourth Proportional to 230.20, 317.68 and 126.70

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Solution

The fourth proportional to 230.20, 317.68 and 126.70 is: 174.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.20 : 317.68 = 126.70 : x
  2. Step 2: Convert to fraction form
    230.20/317.68 = 126.70/x
  3. Step 3: Cross multiply
    230.20x = 317.68 × 126.70
  4. Step 4: Simplify right side
    230.20x = 40,251.09
  5. Step 5: Solve for x
    x = 40,251.09/230.20
  6. Step 6: Final answer
    x = 174.85

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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.