Home / 27,805.21-38,388.62-21,419.78

Finding the Fourth Proportional to 27,805.21, 38,388.62 and 21,419.78

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Solution

The fourth proportional to 27,805.21, 38,388.62 and 21,419.78 is: 29,572.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    27,805.21 : 38,388.62 = 21,419.78 : x
  2. Step 2: Convert to fraction form
    27,805.21/38,388.62 = 21,419.78/x
  3. Step 3: Cross multiply
    27,805.21x = 38,388.62 × 21,419.78
  4. Step 4: Simplify right side
    27,805.21x = 822,275,794.90
  5. Step 5: Solve for x
    x = 822,275,794.90/27,805.21
  6. Step 6: Final answer
    x = 29,572.72

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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.