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Finding the Fourth Proportional to 21,679.92, 29,918.97 and 12,249.09

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Solution

The fourth proportional to 21,679.92, 29,918.97 and 12,249.09 is: 16,904.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,679.92 : 29,918.97 = 12,249.09 : x
  2. Step 2: Convert to fraction form
    21,679.92/29,918.97 = 12,249.09/x
  3. Step 3: Cross multiply
    21,679.92x = 29,918.97 × 12,249.09
  4. Step 4: Simplify right side
    21,679.92x = 366,480,156.24
  5. Step 5: Solve for x
    x = 366,480,156.24/21,679.92
  6. Step 6: Final answer
    x = 16,904.13

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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.