Home / 3,929.61-5,422.88-2,161.23

Finding the Fourth Proportional to 3,929.61, 5,422.88 and 2,161.23

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Solution

The fourth proportional to 3,929.61, 5,422.88 and 2,161.23 is: 2,982.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.61 : 5,422.88 = 2,161.23 : x
  2. Step 2: Convert to fraction form
    3,929.61/5,422.88 = 2,161.23/x
  3. Step 3: Cross multiply
    3,929.61x = 5,422.88 × 2,161.23
  4. Step 4: Simplify right side
    3,929.61x = 11,720,076.01
  5. Step 5: Solve for x
    x = 11,720,076.01/3,929.61
  6. Step 6: Final answer
    x = 2,982.50

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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.