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Finding the Fourth Proportional to 778.97, 1,168.50 and 316.74

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Solution

The fourth proportional to 778.97, 1,168.50 and 316.74 is: 475.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.97 : 1,168.50 = 316.74 : x
  2. Step 2: Convert to fraction form
    778.97/1,168.50 = 316.74/x
  3. Step 3: Cross multiply
    778.97x = 1,168.50 × 316.74
  4. Step 4: Simplify right side
    778.97x = 370,110.69
  5. Step 5: Solve for x
    x = 370,110.69/778.97
  6. Step 6: Final answer
    x = 475.13

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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.