Home / 20,821.47-28,725.68-12,747.80

Finding the Fourth Proportional to 20,821.47, 28,725.68 and 12,747.80

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Solution

The fourth proportional to 20,821.47, 28,725.68 and 12,747.80 is: 17,587.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,821.47 : 28,725.68 = 12,747.80 : x
  2. Step 2: Convert to fraction form
    20,821.47/28,725.68 = 12,747.80/x
  3. Step 3: Cross multiply
    20,821.47x = 28,725.68 × 12,747.80
  4. Step 4: Simplify right side
    20,821.47x = 366,189,016.14
  5. Step 5: Solve for x
    x = 366,189,016.14/20,821.47
  6. Step 6: Final answer
    x = 17,587.09

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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.