Home / 20,143.47-27,789.05-13,422.54

Finding the Fourth Proportional to 20,143.47, 27,789.05 and 13,422.54

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Solution

The fourth proportional to 20,143.47, 27,789.05 and 13,422.54 is: 18,517.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,143.47 : 27,789.05 = 13,422.54 : x
  2. Step 2: Convert to fraction form
    20,143.47/27,789.05 = 13,422.54/x
  3. Step 3: Cross multiply
    20,143.47x = 27,789.05 × 13,422.54
  4. Step 4: Simplify right side
    20,143.47x = 372,999,568.07
  5. Step 5: Solve for x
    x = 372,999,568.07/20,143.47
  6. Step 6: Final answer
    x = 18,517.15

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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.