Home / 20,231.47-27,919.43-11,278.78

Finding the Fourth Proportional to 20,231.47, 27,919.43 and 11,278.78

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Solution

The fourth proportional to 20,231.47, 27,919.43 and 11,278.78 is: 15,564.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,231.47 : 27,919.43 = 11,278.78 : x
  2. Step 2: Convert to fraction form
    20,231.47/27,919.43 = 11,278.78/x
  3. Step 3: Cross multiply
    20,231.47x = 27,919.43 × 11,278.78
  4. Step 4: Simplify right side
    20,231.47x = 314,896,912.70
  5. Step 5: Solve for x
    x = 314,896,912.70/20,231.47
  6. Step 6: Final answer
    x = 15,564.71

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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.