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Finding the Fourth Proportional to 15,805.81, 21,811.12 and 8,634.34

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Solution

The fourth proportional to 15,805.81, 21,811.12 and 8,634.34 is: 11,914.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,805.81 : 21,811.12 = 8,634.34 : x
  2. Step 2: Convert to fraction form
    15,805.81/21,811.12 = 8,634.34/x
  3. Step 3: Cross multiply
    15,805.81x = 21,811.12 × 8,634.34
  4. Step 4: Simplify right side
    15,805.81x = 188,324,625.86
  5. Step 5: Solve for x
    x = 188,324,625.86/15,805.81
  6. Step 6: Final answer
    x = 11,914.90

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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.