Home / 21,121.35-29,147.20-11,690.11

Finding the Fourth Proportional to 21,121.35, 29,147.20 and 11,690.11

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Solution

The fourth proportional to 21,121.35, 29,147.20 and 11,690.11 is: 16,132.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,121.35 : 29,147.20 = 11,690.11 : x
  2. Step 2: Convert to fraction form
    21,121.35/29,147.20 = 11,690.11/x
  3. Step 3: Cross multiply
    21,121.35x = 29,147.20 × 11,690.11
  4. Step 4: Simplify right side
    21,121.35x = 340,733,974.19
  5. Step 5: Solve for x
    x = 340,733,974.19/21,121.35
  6. Step 6: Final answer
    x = 16,132.21

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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.