Home / 21,419.97-29,560.91-11,991.57

Finding the Fourth Proportional to 21,419.97, 29,560.91 and 11,991.57

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Solution

The fourth proportional to 21,419.97, 29,560.91 and 11,991.57 is: 16,549.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,419.97 : 29,560.91 = 11,991.57 : x
  2. Step 2: Convert to fraction form
    21,419.97/29,560.91 = 11,991.57/x
  3. Step 3: Cross multiply
    21,419.97x = 29,560.91 × 11,991.57
  4. Step 4: Simplify right side
    21,419.97x = 354,481,721.53
  5. Step 5: Solve for x
    x = 354,481,721.53/21,419.97
  6. Step 6: Final answer
    x = 16,549.12

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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.