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Finding the Fourth Proportional to 868.62, 1,198.90 and 574.32

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Solution

The fourth proportional to 868.62, 1,198.90 and 574.32 is: 792.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.62 : 1,198.90 = 574.32 : x
  2. Step 2: Convert to fraction form
    868.62/1,198.90 = 574.32/x
  3. Step 3: Cross multiply
    868.62x = 1,198.90 × 574.32
  4. Step 4: Simplify right side
    868.62x = 688,552.25
  5. Step 5: Solve for x
    x = 688,552.25/868.62
  6. Step 6: Final answer
    x = 792.70

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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.