Home / 20,731.52-28,609.80-12,769.22

Finding the Fourth Proportional to 20,731.52, 28,609.80 and 12,769.22

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Solution

The fourth proportional to 20,731.52, 28,609.80 and 12,769.22 is: 17,621.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,731.52 : 28,609.80 = 12,769.22 : x
  2. Step 2: Convert to fraction form
    20,731.52/28,609.80 = 12,769.22/x
  3. Step 3: Cross multiply
    20,731.52x = 28,609.80 × 12,769.22
  4. Step 4: Simplify right side
    20,731.52x = 365,324,830.36
  5. Step 5: Solve for x
    x = 365,324,830.36/20,731.52
  6. Step 6: Final answer
    x = 17,621.71

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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.