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Finding the Fourth Proportional to 778.72, 1,167.92 and 291.68

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Solution

The fourth proportional to 778.72, 1,167.92 and 291.68 is: 437.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.72 : 1,167.92 = 291.68 : x
  2. Step 2: Convert to fraction form
    778.72/1,167.92 = 291.68/x
  3. Step 3: Cross multiply
    778.72x = 1,167.92 × 291.68
  4. Step 4: Simplify right side
    778.72x = 340,658.91
  5. Step 5: Solve for x
    x = 340,658.91/778.72
  6. Step 6: Final answer
    x = 437.46

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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.