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Finding the Fourth Proportional to 778.32, 1,167.96 and 531.72

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Solution

The fourth proportional to 778.32, 1,167.96 and 531.72 is: 797.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.32 : 1,167.96 = 531.72 : x
  2. Step 2: Convert to fraction form
    778.32/1,167.96 = 531.72/x
  3. Step 3: Cross multiply
    778.32x = 1,167.96 × 531.72
  4. Step 4: Simplify right side
    778.32x = 621,027.69
  5. Step 5: Solve for x
    x = 621,027.69/778.32
  6. Step 6: Final answer
    x = 797.91

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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.