Home / 21,720.82-29,977.96-13,763.78

Finding the Fourth Proportional to 21,720.82, 29,977.96 and 13,763.78

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Solution

The fourth proportional to 21,720.82, 29,977.96 and 13,763.78 is: 18,996.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.82 : 29,977.96 = 13,763.78 : x
  2. Step 2: Convert to fraction form
    21,720.82/29,977.96 = 13,763.78/x
  3. Step 3: Cross multiply
    21,720.82x = 29,977.96 × 13,763.78
  4. Step 4: Simplify right side
    21,720.82x = 412,610,046.29
  5. Step 5: Solve for x
    x = 412,610,046.29/21,720.82
  6. Step 6: Final answer
    x = 18,996.06

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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.