Home / 20,979.76-31,459.92-7,822.66

Finding the Fourth Proportional to 20,979.76, 31,459.92 and 7,822.66

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Solution

The fourth proportional to 20,979.76, 31,459.92 and 7,822.66 is: 11,730.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,979.76 : 31,459.92 = 7,822.66 : x
  2. Step 2: Convert to fraction form
    20,979.76/31,459.92 = 7,822.66/x
  3. Step 3: Cross multiply
    20,979.76x = 31,459.92 × 7,822.66
  4. Step 4: Simplify right side
    20,979.76x = 246,100,257.79
  5. Step 5: Solve for x
    x = 246,100,257.79/20,979.76
  6. Step 6: Final answer
    x = 11,730.37

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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.