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Finding the Fourth Proportional to 15,811.28, 21,819.40 and 8,641.12

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Solution

The fourth proportional to 15,811.28, 21,819.40 and 8,641.12 is: 11,924.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,811.28 : 21,819.40 = 8,641.12 : x
  2. Step 2: Convert to fraction form
    15,811.28/21,819.40 = 8,641.12/x
  3. Step 3: Cross multiply
    15,811.28x = 21,819.40 × 8,641.12
  4. Step 4: Simplify right side
    15,811.28x = 188,544,053.73
  5. Step 5: Solve for x
    x = 188,544,053.73/15,811.28
  6. Step 6: Final answer
    x = 11,924.65

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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.