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Finding the Fourth Proportional to 778.20, 1,167.28 and 230.38

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Solution

The fourth proportional to 778.20, 1,167.28 and 230.38 is: 345.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.20 : 1,167.28 = 230.38 : x
  2. Step 2: Convert to fraction form
    778.20/1,167.28 = 230.38/x
  3. Step 3: Cross multiply
    778.20x = 1,167.28 × 230.38
  4. Step 4: Simplify right side
    778.20x = 268,917.97
  5. Step 5: Solve for x
    x = 268,917.97/778.20
  6. Step 6: Final answer
    x = 345.56

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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.