Home / 21,679.88-29,920.66-12,249.05

Finding the Fourth Proportional to 21,679.88, 29,920.66 and 12,249.05

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Solution

The fourth proportional to 21,679.88, 29,920.66 and 12,249.05 is: 16,905.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,679.88 : 29,920.66 = 12,249.05 : x
  2. Step 2: Convert to fraction form
    21,679.88/29,920.66 = 12,249.05/x
  3. Step 3: Cross multiply
    21,679.88x = 29,920.66 × 12,249.05
  4. Step 4: Simplify right side
    21,679.88x = 366,499,480.15
  5. Step 5: Solve for x
    x = 366,499,480.15/21,679.88
  6. Step 6: Final answer
    x = 16,905.06

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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.