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Finding the Fourth Proportional to 778.70, 1,168.46 and 431.98

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Solution

The fourth proportional to 778.70, 1,168.46 and 431.98 is: 648.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.70 : 1,168.46 = 431.98 : x
  2. Step 2: Convert to fraction form
    778.70/1,168.46 = 431.98/x
  3. Step 3: Cross multiply
    778.70x = 1,168.46 × 431.98
  4. Step 4: Simplify right side
    778.70x = 504,751.35
  5. Step 5: Solve for x
    x = 504,751.35/778.70
  6. Step 6: Final answer
    x = 648.20

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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.