Home / 21,109.57-29,131.20-11,678.14

Finding the Fourth Proportional to 21,109.57, 29,131.20 and 11,678.14

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Solution

The fourth proportional to 21,109.57, 29,131.20 and 11,678.14 is: 16,115.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,109.57 : 29,131.20 = 11,678.14 : x
  2. Step 2: Convert to fraction form
    21,109.57/29,131.20 = 11,678.14/x
  3. Step 3: Cross multiply
    21,109.57x = 29,131.20 × 11,678.14
  4. Step 4: Simplify right side
    21,109.57x = 340,198,231.97
  5. Step 5: Solve for x
    x = 340,198,231.97/21,109.57
  6. Step 6: Final answer
    x = 16,115.83

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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.