Home / 3,909.91-5,395.68-2,117.38

Finding the Fourth Proportional to 3,909.91, 5,395.68 and 2,117.38

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Solution

The fourth proportional to 3,909.91, 5,395.68 and 2,117.38 is: 2,921.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.91 : 5,395.68 = 2,117.38 : x
  2. Step 2: Convert to fraction form
    3,909.91/5,395.68 = 2,117.38/x
  3. Step 3: Cross multiply
    3,909.91x = 5,395.68 × 2,117.38
  4. Step 4: Simplify right side
    3,909.91x = 11,424,704.92
  5. Step 5: Solve for x
    x = 11,424,704.92/3,909.91
  6. Step 6: Final answer
    x = 2,921.99

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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.