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Finding the Fourth Proportional to 868.21, 1,198.13 and 475.24

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Solution

The fourth proportional to 868.21, 1,198.13 and 475.24 is: 655.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.21 : 1,198.13 = 475.24 : x
  2. Step 2: Convert to fraction form
    868.21/1,198.13 = 475.24/x
  3. Step 3: Cross multiply
    868.21x = 1,198.13 × 475.24
  4. Step 4: Simplify right side
    868.21x = 569,399.30
  5. Step 5: Solve for x
    x = 569,399.30/868.21
  6. Step 6: Final answer
    x = 655.83

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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.