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Finding the Fourth Proportional to 27,993.92, 38,631.84 and 15,419.20

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Solution

The fourth proportional to 27,993.92, 38,631.84 and 15,419.20 is: 21,278.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,993.92 : 38,631.84 = 15,419.20 : x
  2. Step 2: Convert to fraction form
    27,993.92/38,631.84 = 15,419.20/x
  3. Step 3: Cross multiply
    27,993.92x = 38,631.84 × 15,419.20
  4. Step 4: Simplify right side
    27,993.92x = 595,672,067.33
  5. Step 5: Solve for x
    x = 595,672,067.33/27,993.92
  6. Step 6: Final answer
    x = 21,278.62

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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.