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Finding the Fourth Proportional to 2,121.28, 3,182.06 and 660.24

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Solution

The fourth proportional to 2,121.28, 3,182.06 and 660.24 is: 990.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.28 : 3,182.06 = 660.24 : x
  2. Step 2: Convert to fraction form
    2,121.28/3,182.06 = 660.24/x
  3. Step 3: Cross multiply
    2,121.28x = 3,182.06 × 660.24
  4. Step 4: Simplify right side
    2,121.28x = 2,100,924.95
  5. Step 5: Solve for x
    x = 2,100,924.95/2,121.28
  6. Step 6: Final answer
    x = 990.41

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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.