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Finding the Fourth Proportional to 2,139.62, 3,209.42 and 753.91

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Solution

The fourth proportional to 2,139.62, 3,209.42 and 753.91 is: 1,130.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.62 : 3,209.42 = 753.91 : x
  2. Step 2: Convert to fraction form
    2,139.62/3,209.42 = 753.91/x
  3. Step 3: Cross multiply
    2,139.62x = 3,209.42 × 753.91
  4. Step 4: Simplify right side
    2,139.62x = 2,419,607.69
  5. Step 5: Solve for x
    x = 2,419,607.69/2,139.62
  6. Step 6: Final answer
    x = 1,130.86

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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.