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Finding the Fourth Proportional to 778.08, 1,167.17 and 315.85

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Solution

The fourth proportional to 778.08, 1,167.17 and 315.85 is: 473.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.08 : 1,167.17 = 315.85 : x
  2. Step 2: Convert to fraction form
    778.08/1,167.17 = 315.85/x
  3. Step 3: Cross multiply
    778.08x = 1,167.17 × 315.85
  4. Step 4: Simplify right side
    778.08x = 368,649.07
  5. Step 5: Solve for x
    x = 368,649.07/778.08
  6. Step 6: Final answer
    x = 473.80

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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.