Home / 21,111.45-29,131.24-12,161.85

Finding the Fourth Proportional to 21,111.45, 29,131.24 and 12,161.85

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Solution

The fourth proportional to 21,111.45, 29,131.24 and 12,161.85 is: 16,781.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,111.45 : 29,131.24 = 12,161.85 : x
  2. Step 2: Convert to fraction form
    21,111.45/29,131.24 = 12,161.85/x
  3. Step 3: Cross multiply
    21,111.45x = 29,131.24 × 12,161.85
  4. Step 4: Simplify right side
    21,111.45x = 354,289,771.19
  5. Step 5: Solve for x
    x = 354,289,771.19/21,111.45
  6. Step 6: Final answer
    x = 16,781.88

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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.