Home / 3,929.68-5,422.84-2,161.24

Finding the Fourth Proportional to 3,929.68, 5,422.84 and 2,161.24

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Solution

The fourth proportional to 3,929.68, 5,422.84 and 2,161.24 is: 2,982.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.68 : 5,422.84 = 2,161.24 : x
  2. Step 2: Convert to fraction form
    3,929.68/5,422.84 = 2,161.24/x
  3. Step 3: Cross multiply
    3,929.68x = 5,422.84 × 2,161.24
  4. Step 4: Simplify right side
    3,929.68x = 11,720,058.72
  5. Step 5: Solve for x
    x = 11,720,058.72/3,929.68
  6. Step 6: Final answer
    x = 2,982.45

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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.