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Finding the Fourth Proportional to 10,889.87, 15,027.91 and 5,921.87

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Solution

The fourth proportional to 10,889.87, 15,027.91 and 5,921.87 is: 8,172.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,889.87 : 15,027.91 = 5,921.87 : x
  2. Step 2: Convert to fraction form
    10,889.87/15,027.91 = 5,921.87/x
  3. Step 3: Cross multiply
    10,889.87x = 15,027.91 × 5,921.87
  4. Step 4: Simplify right side
    10,889.87x = 88,993,329.39
  5. Step 5: Solve for x
    x = 88,993,329.39/10,889.87
  6. Step 6: Final answer
    x = 8,172.12

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.