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Finding the Fourth Proportional to 778.59, 1,168.47 and 531.21

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Solution

The fourth proportional to 778.59, 1,168.47 and 531.21 is: 797.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.59 : 1,168.47 = 531.21 : x
  2. Step 2: Convert to fraction form
    778.59/1,168.47 = 531.21/x
  3. Step 3: Cross multiply
    778.59x = 1,168.47 × 531.21
  4. Step 4: Simplify right side
    778.59x = 620,702.95
  5. Step 5: Solve for x
    x = 620,702.95/778.59
  6. Step 6: Final answer
    x = 797.21

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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.