Home / 3,929.46-5,422.77-2,161.18

Finding the Fourth Proportional to 3,929.46, 5,422.77 and 2,161.18

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Solution

The fourth proportional to 3,929.46, 5,422.77 and 2,161.18 is: 2,982.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.46 : 5,422.77 = 2,161.18 : x
  2. Step 2: Convert to fraction form
    3,929.46/5,422.77 = 2,161.18/x
  3. Step 3: Cross multiply
    3,929.46x = 5,422.77 × 2,161.18
  4. Step 4: Simplify right side
    3,929.46x = 11,719,568.51
  5. Step 5: Solve for x
    x = 11,719,568.51/3,929.46
  6. Step 6: Final answer
    x = 2,982.49

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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.