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Finding the Fourth Proportional to 868.20, 1,199.10 and 633.19

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Solution

The fourth proportional to 868.20, 1,199.10 and 633.19 is: 874.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    868.20 : 1,199.10 = 633.19 : x
  2. Step 2: Convert to fraction form
    868.20/1,199.10 = 633.19/x
  3. Step 3: Cross multiply
    868.20x = 1,199.10 × 633.19
  4. Step 4: Simplify right side
    868.20x = 759,258.13
  5. Step 5: Solve for x
    x = 759,258.13/868.20
  6. Step 6: Final answer
    x = 874.52

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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.