Home / 21,720.78-29,977.21-13,227.88

Finding the Fourth Proportional to 21,720.78, 29,977.21 and 13,227.88

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Solution

The fourth proportional to 21,720.78, 29,977.21 and 13,227.88 is: 18,256.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.78 : 29,977.21 = 13,227.88 : x
  2. Step 2: Convert to fraction form
    21,720.78/29,977.21 = 13,227.88/x
  3. Step 3: Cross multiply
    21,720.78x = 29,977.21 × 13,227.88
  4. Step 4: Simplify right side
    21,720.78x = 396,534,944.32
  5. Step 5: Solve for x
    x = 396,534,944.32/21,720.78
  6. Step 6: Final answer
    x = 18,256.02

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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.