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Finding the Fourth Proportional to 778.47, 1,167.92 and 339.64

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Solution

The fourth proportional to 778.47, 1,167.92 and 339.64 is: 509.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.47 : 1,167.92 = 339.64 : x
  2. Step 2: Convert to fraction form
    778.47/1,167.92 = 339.64/x
  3. Step 3: Cross multiply
    778.47x = 1,167.92 × 339.64
  4. Step 4: Simplify right side
    778.47x = 396,677.48
  5. Step 5: Solve for x
    x = 396,677.48/778.47
  6. Step 6: Final answer
    x = 509.56

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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.