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Finding the Fourth Proportional to 921.68, 1,379.32 and 868.38

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Solution

The fourth proportional to 921.68, 1,379.32 and 868.38 is: 1,299.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.68 : 1,379.32 = 868.38 : x
  2. Step 2: Convert to fraction form
    921.68/1,379.32 = 868.38/x
  3. Step 3: Cross multiply
    921.68x = 1,379.32 × 868.38
  4. Step 4: Simplify right side
    921.68x = 1,197,773.90
  5. Step 5: Solve for x
    x = 1,197,773.90/921.68
  6. Step 6: Final answer
    x = 1,299.56

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.