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Finding the Fourth Proportional to 778.60, 1,168.31 and 291.79

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Solution

The fourth proportional to 778.60, 1,168.31 and 291.79 is: 437.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.60 : 1,168.31 = 291.79 : x
  2. Step 2: Convert to fraction form
    778.60/1,168.31 = 291.79/x
  3. Step 3: Cross multiply
    778.60x = 1,168.31 × 291.79
  4. Step 4: Simplify right side
    778.60x = 340,901.17
  5. Step 5: Solve for x
    x = 340,901.17/778.60
  6. Step 6: Final answer
    x = 437.84

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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.