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Finding the Fourth Proportional to 881.38, 1,322.07 and 515.91

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Solution

The fourth proportional to 881.38, 1,322.07 and 515.91 is: 773.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.38 : 1,322.07 = 515.91 : x
  2. Step 2: Convert to fraction form
    881.38/1,322.07 = 515.91/x
  3. Step 3: Cross multiply
    881.38x = 1,322.07 × 515.91
  4. Step 4: Simplify right side
    881.38x = 682,069.13
  5. Step 5: Solve for x
    x = 682,069.13/881.38
  6. Step 6: Final answer
    x = 773.87

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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.