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Finding the Fourth Proportional to 18,754.20, 28,131.30 and 16,939.80

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Solution

The fourth proportional to 18,754.20, 28,131.30 and 16,939.80 is: 25,409.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,754.20 : 28,131.30 = 16,939.80 : x
  2. Step 2: Convert to fraction form
    18,754.20/28,131.30 = 16,939.80/x
  3. Step 3: Cross multiply
    18,754.20x = 28,131.30 × 16,939.80
  4. Step 4: Simplify right side
    18,754.20x = 476,538,595.74
  5. Step 5: Solve for x
    x = 476,538,595.74/18,754.20
  6. Step 6: Final answer
    x = 25,409.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.