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Finding the Fourth Proportional to 868.98, 1,198.09 and 632.74

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Solution

The fourth proportional to 868.98, 1,198.09 and 632.74 is: 872.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.98 : 1,198.09 = 632.74 : x
  2. Step 2: Convert to fraction form
    868.98/1,198.09 = 632.74/x
  3. Step 3: Cross multiply
    868.98x = 1,198.09 × 632.74
  4. Step 4: Simplify right side
    868.98x = 758,079.47
  5. Step 5: Solve for x
    x = 758,079.47/868.98
  6. Step 6: Final answer
    x = 872.38

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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.