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Finding the Fourth Proportional to 8,005.31, 12,009.79 and 2,811.19

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Solution

The fourth proportional to 8,005.31, 12,009.79 and 2,811.19 is: 4,217.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,005.31 : 12,009.79 = 2,811.19 : x
  2. Step 2: Convert to fraction form
    8,005.31/12,009.79 = 2,811.19/x
  3. Step 3: Cross multiply
    8,005.31x = 12,009.79 × 2,811.19
  4. Step 4: Simplify right side
    8,005.31x = 33,761,775.04
  5. Step 5: Solve for x
    x = 33,761,775.04/8,005.31
  6. Step 6: Final answer
    x = 4,217.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.