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Finding the Fourth Proportional to 18,705.44, 28,039.20 and 12,135.80

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Solution

The fourth proportional to 18,705.44, 28,039.20 and 12,135.80 is: 18,191.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.44 : 28,039.20 = 12,135.80 : x
  2. Step 2: Convert to fraction form
    18,705.44/28,039.20 = 12,135.80/x
  3. Step 3: Cross multiply
    18,705.44x = 28,039.20 × 12,135.80
  4. Step 4: Simplify right side
    18,705.44x = 340,278,123.36
  5. Step 5: Solve for x
    x = 340,278,123.36/18,705.44
  6. Step 6: Final answer
    x = 18,191.40

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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.