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Finding the Fourth Proportional to 21,660.75, 29,890.22 and 12,229.11

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Solution

The fourth proportional to 21,660.75, 29,890.22 and 12,229.11 is: 16,875.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,660.75 : 29,890.22 = 12,229.11 : x
  2. Step 2: Convert to fraction form
    21,660.75/29,890.22 = 12,229.11/x
  3. Step 3: Cross multiply
    21,660.75x = 29,890.22 × 12,229.11
  4. Step 4: Simplify right side
    21,660.75x = 365,530,727.16
  5. Step 5: Solve for x
    x = 365,530,727.16/21,660.75
  6. Step 6: Final answer
    x = 16,875.26

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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.