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Finding the Fourth Proportional to 778.38, 1,168.31 and 559.23

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Solution

The fourth proportional to 778.38, 1,168.31 and 559.23 is: 839.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.38 : 1,168.31 = 559.23 : x
  2. Step 2: Convert to fraction form
    778.38/1,168.31 = 559.23/x
  3. Step 3: Cross multiply
    778.38x = 1,168.31 × 559.23
  4. Step 4: Simplify right side
    778.38x = 653,354.00
  5. Step 5: Solve for x
    x = 653,354.00/778.38
  6. Step 6: Final answer
    x = 839.38

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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.