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Finding the Fourth Proportional to 18,720.78, 28,071.78 and 6,236.42

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Solution

The fourth proportional to 18,720.78, 28,071.78 and 6,236.42 is: 9,351.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.78 : 28,071.78 = 6,236.42 : x
  2. Step 2: Convert to fraction form
    18,720.78/28,071.78 = 6,236.42/x
  3. Step 3: Cross multiply
    18,720.78x = 28,071.78 × 6,236.42
  4. Step 4: Simplify right side
    18,720.78x = 175,067,269.87
  5. Step 5: Solve for x
    x = 175,067,269.87/18,720.78
  6. Step 6: Final answer
    x = 9,351.49

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