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Finding the Fourth Proportional to 778.26, 1,167.38 and 339.94

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Solution

The fourth proportional to 778.26, 1,167.38 and 339.94 is: 509.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.26 : 1,167.38 = 339.94 : x
  2. Step 2: Convert to fraction form
    778.26/1,167.38 = 339.94/x
  3. Step 3: Cross multiply
    778.26x = 1,167.38 × 339.94
  4. Step 4: Simplify right side
    778.26x = 396,839.16
  5. Step 5: Solve for x
    x = 396,839.16/778.26
  6. Step 6: Final answer
    x = 509.91

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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.