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Finding the Fourth Proportional to 15,621.14, 21,556.97 and 8,906.54

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Solution

The fourth proportional to 15,621.14, 21,556.97 and 8,906.54 is: 12,290.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,621.14 : 21,556.97 = 8,906.54 : x
  2. Step 2: Convert to fraction form
    15,621.14/21,556.97 = 8,906.54/x
  3. Step 3: Cross multiply
    15,621.14x = 21,556.97 × 8,906.54
  4. Step 4: Simplify right side
    15,621.14x = 191,997,863.27
  5. Step 5: Solve for x
    x = 191,997,863.27/15,621.14
  6. Step 6: Final answer
    x = 12,290.90

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1.5x scale

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.