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Finding the Fourth Proportional to 778.78, 1,168.17 and 201.66

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Solution

The fourth proportional to 778.78, 1,168.17 and 201.66 is: 302.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.78 : 1,168.17 = 201.66 : x
  2. Step 2: Convert to fraction form
    778.78/1,168.17 = 201.66/x
  3. Step 3: Cross multiply
    778.78x = 1,168.17 × 201.66
  4. Step 4: Simplify right side
    778.78x = 235,569.16
  5. Step 5: Solve for x
    x = 235,569.16/778.78
  6. Step 6: Final answer
    x = 302.48

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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.