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Finding the Fourth Proportional to 2,121.62, 3,182.31 and 660.66

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Solution

The fourth proportional to 2,121.62, 3,182.31 and 660.66 is: 990.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.62 : 3,182.31 = 660.66 : x
  2. Step 2: Convert to fraction form
    2,121.62/3,182.31 = 660.66/x
  3. Step 3: Cross multiply
    2,121.62x = 3,182.31 × 660.66
  4. Step 4: Simplify right side
    2,121.62x = 2,102,414.85
  5. Step 5: Solve for x
    x = 2,102,414.85/2,121.62
  6. Step 6: Final answer
    x = 990.95

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1.5x scale

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.