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Finding the Fourth Proportional to 18,705.72, 28,019.70 and 13,704.60

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Solution

The fourth proportional to 18,705.72, 28,019.70 and 13,704.60 is: 20,528.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,705.72 : 28,019.70 = 13,704.60 : x
  2. Step 2: Convert to fraction form
    18,705.72/28,019.70 = 13,704.60/x
  3. Step 3: Cross multiply
    18,705.72x = 28,019.70 × 13,704.60
  4. Step 4: Simplify right side
    18,705.72x = 383,998,780.62
  5. Step 5: Solve for x
    x = 383,998,780.62/18,705.72
  6. Step 6: Final answer
    x = 20,528.41

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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.