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Finding the Fourth Proportional to 868.65, 1,198.52 and 825.53

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Solution

The fourth proportional to 868.65, 1,198.52 and 825.53 is: 1,139.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.65 : 1,198.52 = 825.53 : x
  2. Step 2: Convert to fraction form
    868.65/1,198.52 = 825.53/x
  3. Step 3: Cross multiply
    868.65x = 1,198.52 × 825.53
  4. Step 4: Simplify right side
    868.65x = 989,404.10
  5. Step 5: Solve for x
    x = 989,404.10/868.65
  6. Step 6: Final answer
    x = 1,139.01

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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.