Home / 20,081.28-27,712.67-11,128.89

Finding the Fourth Proportional to 20,081.28, 27,712.67 and 11,128.89

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Solution

The fourth proportional to 20,081.28, 27,712.67 and 11,128.89 is: 15,358.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,081.28 : 27,712.67 = 11,128.89 : x
  2. Step 2: Convert to fraction form
    20,081.28/27,712.67 = 11,128.89/x
  3. Step 3: Cross multiply
    20,081.28x = 27,712.67 × 11,128.89
  4. Step 4: Simplify right side
    20,081.28x = 308,411,200.39
  5. Step 5: Solve for x
    x = 308,411,200.39/20,081.28
  6. Step 6: Final answer
    x = 15,358.14

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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.