Home / 20,843.20-28,760.88-12,780.46

Finding the Fourth Proportional to 20,843.20, 28,760.88 and 12,780.46

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Solution

The fourth proportional to 20,843.20, 28,760.88 and 12,780.46 is: 17,635.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,843.20 : 28,760.88 = 12,780.46 : x
  2. Step 2: Convert to fraction form
    20,843.20/28,760.88 = 12,780.46/x
  3. Step 3: Cross multiply
    20,843.20x = 28,760.88 × 12,780.46
  4. Step 4: Simplify right side
    20,843.20x = 367,577,276.40
  5. Step 5: Solve for x
    x = 367,577,276.40/20,843.20
  6. Step 6: Final answer
    x = 17,635.36

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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.