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Finding the Fourth Proportional to 2,121.96, 3,182.96 and 661

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Solution

The fourth proportional to 2,121.96, 3,182.96 and 661 is: 991.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,121.96 : 3,182.96 = 661 : x
  2. Step 2: Convert to fraction form
    2,121.96/3,182.96 = 661/x
  3. Step 3: Cross multiply
    2,121.96x = 3,182.96 × 661
  4. Step 4: Simplify right side
    2,121.96x = 2,103,936.56
  5. Step 5: Solve for x
    x = 2,103,936.56/2,121.96
  6. Step 6: Final answer
    x = 991.51

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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.