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Finding the Fourth Proportional to 778.64, 1,167.96 and 291.58

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Solution

The fourth proportional to 778.64, 1,167.96 and 291.58 is: 437.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.64 : 1,167.96 = 291.58 : x
  2. Step 2: Convert to fraction form
    778.64/1,167.96 = 291.58/x
  3. Step 3: Cross multiply
    778.64x = 1,167.96 × 291.58
  4. Step 4: Simplify right side
    778.64x = 340,553.78
  5. Step 5: Solve for x
    x = 340,553.78/778.64
  6. Step 6: Final answer
    x = 437.37

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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.