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Finding the Fourth Proportional to 15,811.44, 21,819.78 and 8,737.80

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Solution

The fourth proportional to 15,811.44, 21,819.78 and 8,737.80 is: 12,058.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,811.44 : 21,819.78 = 8,737.80 : x
  2. Step 2: Convert to fraction form
    15,811.44/21,819.78 = 8,737.80/x
  3. Step 3: Cross multiply
    15,811.44x = 21,819.78 × 8,737.80
  4. Step 4: Simplify right side
    15,811.44x = 190,656,873.68
  5. Step 5: Solve for x
    x = 190,656,873.68/15,811.44
  6. Step 6: Final answer
    x = 12,058.16

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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.