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Finding the Fourth Proportional to 778.90, 1,168.35 and 316.57

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Solution

The fourth proportional to 778.90, 1,168.35 and 316.57 is: 474.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.90 : 1,168.35 = 316.57 : x
  2. Step 2: Convert to fraction form
    778.90/1,168.35 = 316.57/x
  3. Step 3: Cross multiply
    778.90x = 1,168.35 × 316.57
  4. Step 4: Simplify right side
    778.90x = 369,864.56
  5. Step 5: Solve for x
    x = 369,864.56/778.90
  6. Step 6: Final answer
    x = 474.86

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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.