Home / 3,929.11-5,422.14-2,160.68

Finding the Fourth Proportional to 3,929.11, 5,422.14 and 2,160.68

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Solution

The fourth proportional to 3,929.11, 5,422.14 and 2,160.68 is: 2,981.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,929.11 : 5,422.14 = 2,160.68 : x
  2. Step 2: Convert to fraction form
    3,929.11/5,422.14 = 2,160.68/x
  3. Step 3: Cross multiply
    3,929.11x = 5,422.14 × 2,160.68
  4. Step 4: Simplify right side
    3,929.11x = 11,715,482.34
  5. Step 5: Solve for x
    x = 11,715,482.34/3,929.11
  6. Step 6: Final answer
    x = 2,981.72

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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.