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Finding the Fourth Proportional to 1,481.31, 2,221.49 and 660.31

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Solution

The fourth proportional to 1,481.31, 2,221.49 and 660.31 is: 990.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,481.31 : 2,221.49 = 660.31 : x
  2. Step 2: Convert to fraction form
    1,481.31/2,221.49 = 660.31/x
  3. Step 3: Cross multiply
    1,481.31x = 2,221.49 × 660.31
  4. Step 4: Simplify right side
    1,481.31x = 1,466,868.16
  5. Step 5: Solve for x
    x = 1,466,868.16/1,481.31
  6. Step 6: Final answer
    x = 990.25

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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.