Home / 21,979.76-32,982.60-8,138.48

Finding the Fourth Proportional to 21,979.76, 32,982.60 and 8,138.48

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Solution

The fourth proportional to 21,979.76, 32,982.60 and 8,138.48 is: 12,212.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,979.76 : 32,982.60 = 8,138.48 : x
  2. Step 2: Convert to fraction form
    21,979.76/32,982.60 = 8,138.48/x
  3. Step 3: Cross multiply
    21,979.76x = 32,982.60 × 8,138.48
  4. Step 4: Simplify right side
    21,979.76x = 268,428,230.45
  5. Step 5: Solve for x
    x = 268,428,230.45/21,979.76
  6. Step 6: Final answer
    x = 12,212.52

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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.