Home / 20,845.75-28,769.88-11,891.20

Finding the Fourth Proportional to 20,845.75, 28,769.88 and 11,891.20

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Solution

The fourth proportional to 20,845.75, 28,769.88 and 11,891.20 is: 16,411.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,845.75 : 28,769.88 = 11,891.20 : x
  2. Step 2: Convert to fraction form
    20,845.75/28,769.88 = 11,891.20/x
  3. Step 3: Cross multiply
    20,845.75x = 28,769.88 × 11,891.20
  4. Step 4: Simplify right side
    20,845.75x = 342,108,397.06
  5. Step 5: Solve for x
    x = 342,108,397.06/20,845.75
  6. Step 6: Final answer
    x = 16,411.42

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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.