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Finding the Fourth Proportional to 868.40, 1,198.48 and 633.12

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Solution

The fourth proportional to 868.40, 1,198.48 and 633.12 is: 873.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.40 : 1,198.48 = 633.12 : x
  2. Step 2: Convert to fraction form
    868.40/1,198.48 = 633.12/x
  3. Step 3: Cross multiply
    868.40x = 1,198.48 × 633.12
  4. Step 4: Simplify right side
    868.40x = 758,781.66
  5. Step 5: Solve for x
    x = 758,781.66/868.40
  6. Step 6: Final answer
    x = 873.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.