Home / 21,720.33-29,977.28-13,763.30

Finding the Fourth Proportional to 21,720.33, 29,977.28 and 13,763.30

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Solution

The fourth proportional to 21,720.33, 29,977.28 and 13,763.30 is: 18,995.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,720.33 : 29,977.28 = 13,763.30 : x
  2. Step 2: Convert to fraction form
    21,720.33/29,977.28 = 13,763.30/x
  3. Step 3: Cross multiply
    21,720.33x = 29,977.28 × 13,763.30
  4. Step 4: Simplify right side
    21,720.33x = 412,586,079.12
  5. Step 5: Solve for x
    x = 412,586,079.12/21,720.33
  6. Step 6: Final answer
    x = 18,995.39

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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.