Home / 3,929.21-5,422.31-2,160.81

Finding the Fourth Proportional to 3,929.21, 5,422.31 and 2,160.81

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Solution

The fourth proportional to 3,929.21, 5,422.31 and 2,160.81 is: 2,981.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.21 : 5,422.31 = 2,160.81 : x
  2. Step 2: Convert to fraction form
    3,929.21/5,422.31 = 2,160.81/x
  3. Step 3: Cross multiply
    3,929.21x = 5,422.31 × 2,160.81
  4. Step 4: Simplify right side
    3,929.21x = 11,716,578.97
  5. Step 5: Solve for x
    x = 11,716,578.97/3,929.21
  6. Step 6: Final answer
    x = 2,981.92

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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.