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Finding the Fourth Proportional to 768.87, 1,147.37 and 686.85

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Solution

The fourth proportional to 768.87, 1,147.37 and 686.85 is: 1,024.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    768.87 : 1,147.37 = 686.85 : x
  2. Step 2: Convert to fraction form
    768.87/1,147.37 = 686.85/x
  3. Step 3: Cross multiply
    768.87x = 1,147.37 × 686.85
  4. Step 4: Simplify right side
    768.87x = 788,067.65
  5. Step 5: Solve for x
    x = 788,067.65/768.87
  6. Step 6: Final answer
    x = 1,024.97

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.