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Finding the Fourth Proportional to 921.38, 1,380.44 and 660.96

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Solution

The fourth proportional to 921.38, 1,380.44 and 660.96 is: 990.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.38 : 1,380.44 = 660.96 : x
  2. Step 2: Convert to fraction form
    921.38/1,380.44 = 660.96/x
  3. Step 3: Cross multiply
    921.38x = 1,380.44 × 660.96
  4. Step 4: Simplify right side
    921.38x = 912,415.62
  5. Step 5: Solve for x
    x = 912,415.62/921.38
  6. Step 6: Final answer
    x = 990.27

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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.