Home / 20,912.13-28,864.26-12,949.83

Finding the Fourth Proportional to 20,912.13, 28,864.26 and 12,949.83

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Solution

The fourth proportional to 20,912.13, 28,864.26 and 12,949.83 is: 17,874.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,912.13 : 28,864.26 = 12,949.83 : x
  2. Step 2: Convert to fraction form
    20,912.13/28,864.26 = 12,949.83/x
  3. Step 3: Cross multiply
    20,912.13x = 28,864.26 × 12,949.83
  4. Step 4: Simplify right side
    20,912.13x = 373,787,260.08
  5. Step 5: Solve for x
    x = 373,787,260.08/20,912.13
  6. Step 6: Final answer
    x = 17,874.18

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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.