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Finding the Fourth Proportional to 18,789.72, 28,181.16 and 7,099.08

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Solution

The fourth proportional to 18,789.72, 28,181.16 and 7,099.08 is: 10,647.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,789.72 : 28,181.16 = 7,099.08 : x
  2. Step 2: Convert to fraction form
    18,789.72/28,181.16 = 7,099.08/x
  3. Step 3: Cross multiply
    18,789.72x = 28,181.16 × 7,099.08
  4. Step 4: Simplify right side
    18,789.72x = 200,060,309.33
  5. Step 5: Solve for x
    x = 200,060,309.33/18,789.72
  6. Step 6: Final answer
    x = 10,647.33

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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.