Home / 20,810.27-28,718.20-11,857.75

Finding the Fourth Proportional to 20,810.27, 28,718.20 and 11,857.75

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Solution

The fourth proportional to 20,810.27, 28,718.20 and 11,857.75 is: 16,363.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.27 : 28,718.20 = 11,857.75 : x
  2. Step 2: Convert to fraction form
    20,810.27/28,718.20 = 11,857.75/x
  3. Step 3: Cross multiply
    20,810.27x = 28,718.20 × 11,857.75
  4. Step 4: Simplify right side
    20,810.27x = 340,533,179.08
  5. Step 5: Solve for x
    x = 340,533,179.08/20,810.27
  6. Step 6: Final answer
    x = 16,363.71

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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.