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Finding the Fourth Proportional to 11,589.72, 15,991.14 and 7,819.88

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Solution

The fourth proportional to 11,589.72, 15,991.14 and 7,819.88 is: 10,789.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,589.72 : 15,991.14 = 7,819.88 : x
  2. Step 2: Convert to fraction form
    11,589.72/15,991.14 = 7,819.88/x
  3. Step 3: Cross multiply
    11,589.72x = 15,991.14 × 7,819.88
  4. Step 4: Simplify right side
    11,589.72x = 125,048,795.86
  5. Step 5: Solve for x
    x = 125,048,795.86/11,589.72
  6. Step 6: Final answer
    x = 10,789.63

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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.