Home / 3,929.14-5,422.20-2,160.72

Finding the Fourth Proportional to 3,929.14, 5,422.20 and 2,160.72

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Solution

The fourth proportional to 3,929.14, 5,422.20 and 2,160.72 is: 2,981.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.14 : 5,422.20 = 2,160.72 : x
  2. Step 2: Convert to fraction form
    3,929.14/5,422.20 = 2,160.72/x
  3. Step 3: Cross multiply
    3,929.14x = 5,422.20 × 2,160.72
  4. Step 4: Simplify right side
    3,929.14x = 11,715,855.98
  5. Step 5: Solve for x
    x = 11,715,855.98/3,929.14
  6. Step 6: Final answer
    x = 2,981.79

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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.