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Finding the Fourth Proportional to 87,803.65, 131,705.81 and 21,243.67

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Solution

The fourth proportional to 87,803.65, 131,705.81 and 21,243.67 is: 31,865.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,803.65 : 131,705.81 = 21,243.67 : x
  2. Step 2: Convert to fraction form
    87,803.65/131,705.81 = 21,243.67/x
  3. Step 3: Cross multiply
    87,803.65x = 131,705.81 × 21,243.67
  4. Step 4: Simplify right side
    87,803.65x = 2,797,914,764.72
  5. Step 5: Solve for x
    x = 2,797,914,764.72/87,803.65
  6. Step 6: Final answer
    x = 31,865.59

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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.