Home / 21,729.25-29,988.19-13,768.57

Finding the Fourth Proportional to 21,729.25, 29,988.19 and 13,768.57

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Solution

The fourth proportional to 21,729.25, 29,988.19 and 13,768.57 is: 19,001.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,729.25 : 29,988.19 = 13,768.57 : x
  2. Step 2: Convert to fraction form
    21,729.25/29,988.19 = 13,768.57/x
  3. Step 3: Cross multiply
    21,729.25x = 29,988.19 × 13,768.57
  4. Step 4: Simplify right side
    21,729.25x = 412,894,493.19
  5. Step 5: Solve for x
    x = 412,894,493.19/21,729.25
  6. Step 6: Final answer
    x = 19,001.78

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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.