Home / 21,724.88-29,998.72-13,781.20

Finding the Fourth Proportional to 21,724.88, 29,998.72 and 13,781.20

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Solution

The fourth proportional to 21,724.88, 29,998.72 and 13,781.20 is: 19,029.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,724.88 : 29,998.72 = 13,781.20 : x
  2. Step 2: Convert to fraction form
    21,724.88/29,998.72 = 13,781.20/x
  3. Step 3: Cross multiply
    21,724.88x = 29,998.72 × 13,781.20
  4. Step 4: Simplify right side
    21,724.88x = 413,418,360.06
  5. Step 5: Solve for x
    x = 413,418,360.06/21,724.88
  6. Step 6: Final answer
    x = 19,029.72

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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.