Home / 20,081.20-27,712.29-11,128.81

Finding the Fourth Proportional to 20,081.20, 27,712.29 and 11,128.81

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Solution

The fourth proportional to 20,081.20, 27,712.29 and 11,128.81 is: 15,357.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,081.20 : 27,712.29 = 11,128.81 : x
  2. Step 2: Convert to fraction form
    20,081.20/27,712.29 = 11,128.81/x
  3. Step 3: Cross multiply
    20,081.20x = 27,712.29 × 11,128.81
  4. Step 4: Simplify right side
    20,081.20x = 308,404,810.07
  5. Step 5: Solve for x
    x = 308,404,810.07/20,081.20
  6. Step 6: Final answer
    x = 15,357.89

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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.