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Finding the Fourth Proportional to 18,722.78, 28,074.78 and 6,238.42

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Solution

The fourth proportional to 18,722.78, 28,074.78 and 6,238.42 is: 9,354.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,722.78 : 28,074.78 = 6,238.42 : x
  2. Step 2: Convert to fraction form
    18,722.78/28,074.78 = 6,238.42/x
  3. Step 3: Cross multiply
    18,722.78x = 28,074.78 × 6,238.42
  4. Step 4: Simplify right side
    18,722.78x = 175,142,269.05
  5. Step 5: Solve for x
    x = 175,142,269.05/18,722.78
  6. Step 6: Final answer
    x = 9,354.50

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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.