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Finding the Fourth Proportional to 3,711.70, 5,122.16 and 2,139.79

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Solution

The fourth proportional to 3,711.70, 5,122.16 and 2,139.79 is: 2,952.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,711.70 : 5,122.16 = 2,139.79 : x
  2. Step 2: Convert to fraction form
    3,711.70/5,122.16 = 2,139.79/x
  3. Step 3: Cross multiply
    3,711.70x = 5,122.16 × 2,139.79
  4. Step 4: Simplify right side
    3,711.70x = 10,960,346.75
  5. Step 5: Solve for x
    x = 10,960,346.75/3,711.70
  6. Step 6: Final answer
    x = 2,952.92

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.