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Finding the Fourth Proportional to 21,181, 29,229.78 and 11,751.52

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Solution

The fourth proportional to 21,181, 29,229.78 and 11,751.52 is: 16,217.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,181 : 29,229.78 = 11,751.52 : x
  2. Step 2: Convert to fraction form
    21,181/29,229.78 = 11,751.52/x
  3. Step 3: Cross multiply
    21,181x = 29,229.78 × 11,751.52
  4. Step 4: Simplify right side
    21,181x = 343,494,344.27
  5. Step 5: Solve for x
    x = 343,494,344.27/21,181
  6. Step 6: Final answer
    x = 16,217.10

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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.