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Finding the Fourth Proportional to 778.68, 1,168.50 and 291.78

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Solution

The fourth proportional to 778.68, 1,168.50 and 291.78 is: 437.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.68 : 1,168.50 = 291.78 : x
  2. Step 2: Convert to fraction form
    778.68/1,168.50 = 291.78/x
  3. Step 3: Cross multiply
    778.68x = 1,168.50 × 291.78
  4. Step 4: Simplify right side
    778.68x = 340,944.93
  5. Step 5: Solve for x
    x = 340,944.93/778.68
  6. Step 6: Final answer
    x = 437.85

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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.