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Finding the Fourth Proportional to 769.87, 1,148.86 and 687.85

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Solution

The fourth proportional to 769.87, 1,148.86 and 687.85 is: 1,026.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    769.87 : 1,148.86 = 687.85 : x
  2. Step 2: Convert to fraction form
    769.87/1,148.86 = 687.85/x
  3. Step 3: Cross multiply
    769.87x = 1,148.86 × 687.85
  4. Step 4: Simplify right side
    769.87x = 790,243.35
  5. Step 5: Solve for x
    x = 790,243.35/769.87
  6. Step 6: Final answer
    x = 1,026.46

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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.