Home / 20,423.64-28,179.67-11,920.90

Finding the Fourth Proportional to 20,423.64, 28,179.67 and 11,920.90

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Solution

The fourth proportional to 20,423.64, 28,179.67 and 11,920.90 is: 16,447.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,423.64 : 28,179.67 = 11,920.90 : x
  2. Step 2: Convert to fraction form
    20,423.64/28,179.67 = 11,920.90/x
  3. Step 3: Cross multiply
    20,423.64x = 28,179.67 × 11,920.90
  4. Step 4: Simplify right side
    20,423.64x = 335,927,028.10
  5. Step 5: Solve for x
    x = 335,927,028.10/20,423.64
  6. Step 6: Final answer
    x = 16,447.95

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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.