Home / 20,081.90-27,711.39-11,129.78

Finding the Fourth Proportional to 20,081.90, 27,711.39 and 11,129.78

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Solution

The fourth proportional to 20,081.90, 27,711.39 and 11,129.78 is: 15,358.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,081.90 : 27,711.39 = 11,129.78 : x
  2. Step 2: Convert to fraction form
    20,081.90/27,711.39 = 11,129.78/x
  3. Step 3: Cross multiply
    20,081.90x = 27,711.39 × 11,129.78
  4. Step 4: Simplify right side
    20,081.90x = 308,421,674.19
  5. Step 5: Solve for x
    x = 308,421,674.19/20,081.90
  6. Step 6: Final answer
    x = 15,358.19

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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.