Home / 3,929.74-5,422.91-2,161.33

Finding the Fourth Proportional to 3,929.74, 5,422.91 and 2,161.33

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Solution

The fourth proportional to 3,929.74, 5,422.91 and 2,161.33 is: 2,982.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.74 : 5,422.91 = 2,161.33 : x
  2. Step 2: Convert to fraction form
    3,929.74/5,422.91 = 2,161.33/x
  3. Step 3: Cross multiply
    3,929.74x = 5,422.91 × 2,161.33
  4. Step 4: Simplify right side
    3,929.74x = 11,720,681.81
  5. Step 5: Solve for x
    x = 11,720,681.81/3,929.74
  6. Step 6: Final answer
    x = 2,982.56

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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.