Home / 20,081.02-27,711-11,128.90

Finding the Fourth Proportional to 20,081.02, 27,711 and 11,128.90

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Solution

The fourth proportional to 20,081.02, 27,711 and 11,128.90 is: 15,357.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,081.02 : 27,711 = 11,128.90 : x
  2. Step 2: Convert to fraction form
    20,081.02/27,711 = 11,128.90/x
  3. Step 3: Cross multiply
    20,081.02x = 27,711 × 11,128.90
  4. Step 4: Simplify right side
    20,081.02x = 308,392,947.90
  5. Step 5: Solve for x
    x = 308,392,947.90/20,081.02
  6. Step 6: Final answer
    x = 15,357.43

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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.