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Finding the Fourth Proportional to 15,105.69, 20,843.54 and 8,390.70

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Solution

The fourth proportional to 15,105.69, 20,843.54 and 8,390.70 is: 11,577.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,105.69 : 20,843.54 = 8,390.70 : x
  2. Step 2: Convert to fraction form
    15,105.69/20,843.54 = 8,390.70/x
  3. Step 3: Cross multiply
    15,105.69x = 20,843.54 × 8,390.70
  4. Step 4: Simplify right side
    15,105.69x = 174,891,744.91
  5. Step 5: Solve for x
    x = 174,891,744.91/15,105.69
  6. Step 6: Final answer
    x = 11,577.88

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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.