Home / 13,755.80-18,939.84-12,139.04

Finding the Fourth Proportional to 13,755.80, 18,939.84 and 12,139.04

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Solution

The fourth proportional to 13,755.80, 18,939.84 and 12,139.04 is: 16,713.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,755.80 : 18,939.84 = 12,139.04 : x
  2. Step 2: Convert to fraction form
    13,755.80/18,939.84 = 12,139.04/x
  3. Step 3: Cross multiply
    13,755.80x = 18,939.84 × 12,139.04
  4. Step 4: Simplify right side
    13,755.80x = 229,911,475.35
  5. Step 5: Solve for x
    x = 229,911,475.35/13,755.80
  6. Step 6: Final answer
    x = 16,713.78

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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.