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Finding the Fourth Proportional to 868.52, 1,299.84 and 845.12

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Solution

The fourth proportional to 868.52, 1,299.84 and 845.12 is: 1,264.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.52 : 1,299.84 = 845.12 : x
  2. Step 2: Convert to fraction form
    868.52/1,299.84 = 845.12/x
  3. Step 3: Cross multiply
    868.52x = 1,299.84 × 845.12
  4. Step 4: Simplify right side
    868.52x = 1,098,520.78
  5. Step 5: Solve for x
    x = 1,098,520.78/868.52
  6. Step 6: Final answer
    x = 1,264.82

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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.