Home / 81,680.92-122,463.78-31,719.40

Finding the Fourth Proportional to 81,680.92, 122,463.78 and 31,719.40

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Solution

The fourth proportional to 81,680.92, 122,463.78 and 31,719.40 is: 47,556.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,680.92 : 122,463.78 = 31,719.40 : x
  2. Step 2: Convert to fraction form
    81,680.92/122,463.78 = 31,719.40/x
  3. Step 3: Cross multiply
    81,680.92x = 122,463.78 × 31,719.40
  4. Step 4: Simplify right side
    81,680.92x = 3,884,477,623.33
  5. Step 5: Solve for x
    x = 3,884,477,623.33/81,680.92
  6. Step 6: Final answer
    x = 47,556.73

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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.