Home / 20,080.90-27,711.70-11,128.55

Finding the Fourth Proportional to 20,080.90, 27,711.70 and 11,128.55

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Solution

The fourth proportional to 20,080.90, 27,711.70 and 11,128.55 is: 15,357.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,080.90 : 27,711.70 = 11,128.55 : x
  2. Step 2: Convert to fraction form
    20,080.90/27,711.70 = 11,128.55/x
  3. Step 3: Cross multiply
    20,080.90x = 27,711.70 × 11,128.55
  4. Step 4: Simplify right side
    20,080.90x = 308,391,039.04
  5. Step 5: Solve for x
    x = 308,391,039.04/20,080.90
  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.