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Finding the Fourth Proportional to 15,751.86, 21,738.79 and 8,679.54

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Solution

The fourth proportional to 15,751.86, 21,738.79 and 8,679.54 is: 11,978.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,751.86 : 21,738.79 = 8,679.54 : x
  2. Step 2: Convert to fraction form
    15,751.86/21,738.79 = 8,679.54/x
  3. Step 3: Cross multiply
    15,751.86x = 21,738.79 × 8,679.54
  4. Step 4: Simplify right side
    15,751.86x = 188,682,697.36
  5. Step 5: Solve for x
    x = 188,682,697.36/15,751.86
  6. Step 6: Final answer
    x = 11,978.44

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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.