Home / 3,929.42-5,422.63-2,161.06

Finding the Fourth Proportional to 3,929.42, 5,422.63 and 2,161.06

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Solution

The fourth proportional to 3,929.42, 5,422.63 and 2,161.06 is: 2,982.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.42 : 5,422.63 = 2,161.06 : x
  2. Step 2: Convert to fraction form
    3,929.42/5,422.63 = 2,161.06/x
  3. Step 3: Cross multiply
    3,929.42x = 5,422.63 × 2,161.06
  4. Step 4: Simplify right side
    3,929.42x = 11,718,628.79
  5. Step 5: Solve for x
    x = 11,718,628.79/3,929.42
  6. Step 6: Final answer
    x = 2,982.28

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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.