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Finding the Fourth Proportional to 18,991.35, 28,487.96 and 7,896.87

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Solution

The fourth proportional to 18,991.35, 28,487.96 and 7,896.87 is: 11,845.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,991.35 : 28,487.96 = 7,896.87 : x
  2. Step 2: Convert to fraction form
    18,991.35/28,487.96 = 7,896.87/x
  3. Step 3: Cross multiply
    18,991.35x = 28,487.96 × 7,896.87
  4. Step 4: Simplify right side
    18,991.35x = 224,965,677.20
  5. Step 5: Solve for x
    x = 224,965,677.20/18,991.35
  6. Step 6: Final answer
    x = 11,845.69

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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.