Home / 21,121.40-29,147.82-11,690.12

Finding the Fourth Proportional to 21,121.40, 29,147.82 and 11,690.12

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Solution

The fourth proportional to 21,121.40, 29,147.82 and 11,690.12 is: 16,132.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.40 : 29,147.82 = 11,690.12 : x
  2. Step 2: Convert to fraction form
    21,121.40/29,147.82 = 11,690.12/x
  3. Step 3: Cross multiply
    21,121.40x = 29,147.82 × 11,690.12
  4. Step 4: Simplify right side
    21,121.40x = 340,741,513.54
  5. Step 5: Solve for x
    x = 340,741,513.54/21,121.40
  6. Step 6: Final answer
    x = 16,132.53

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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.