Home / 21,620.94-29,836.85-12,189.43

Finding the Fourth Proportional to 21,620.94, 29,836.85 and 12,189.43

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Solution

The fourth proportional to 21,620.94, 29,836.85 and 12,189.43 is: 16,821.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,620.94 : 29,836.85 = 12,189.43 : x
  2. Step 2: Convert to fraction form
    21,620.94/29,836.85 = 12,189.43/x
  3. Step 3: Cross multiply
    21,620.94x = 29,836.85 × 12,189.43
  4. Step 4: Simplify right side
    21,620.94x = 363,694,260.67
  5. Step 5: Solve for x
    x = 363,694,260.67/21,620.94
  6. Step 6: Final answer
    x = 16,821.39

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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.