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Finding the Fourth Proportional to 778.83, 1,168.51 and 648.21

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Solution

The fourth proportional to 778.83, 1,168.51 and 648.21 is: 972.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.83 : 1,168.51 = 648.21 : x
  2. Step 2: Convert to fraction form
    778.83/1,168.51 = 648.21/x
  3. Step 3: Cross multiply
    778.83x = 1,168.51 × 648.21
  4. Step 4: Simplify right side
    778.83x = 757,439.87
  5. Step 5: Solve for x
    x = 757,439.87/778.83
  6. Step 6: Final answer
    x = 972.54

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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.