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Finding the Fourth Proportional to 778.79, 1,168.39 and 291.88

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Solution

The fourth proportional to 778.79, 1,168.39 and 291.88 is: 437.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.79 : 1,168.39 = 291.88 : x
  2. Step 2: Convert to fraction form
    778.79/1,168.39 = 291.88/x
  3. Step 3: Cross multiply
    778.79x = 1,168.39 × 291.88
  4. Step 4: Simplify right side
    778.79x = 341,029.67
  5. Step 5: Solve for x
    x = 341,029.67/778.79
  6. Step 6: Final answer
    x = 437.90

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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.