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Finding the Fourth Proportional to 18,788.21, 28,186.64 and 5,640.83

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Solution

The fourth proportional to 18,788.21, 28,186.64 and 5,640.83 is: 8,462.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,788.21 : 28,186.64 = 5,640.83 : x
  2. Step 2: Convert to fraction form
    18,788.21/28,186.64 = 5,640.83/x
  3. Step 3: Cross multiply
    18,788.21x = 28,186.64 × 5,640.83
  4. Step 4: Simplify right side
    18,788.21x = 158,996,016.31
  5. Step 5: Solve for x
    x = 158,996,016.31/18,788.21
  6. Step 6: Final answer
    x = 8,462.54

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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.