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Finding the Fourth Proportional to 87,386, 131,079.48 and 21,722

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Solution

The fourth proportional to 87,386, 131,079.48 and 21,722 is: 32,583.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,386 : 131,079.48 = 21,722 : x
  2. Step 2: Convert to fraction form
    87,386/131,079.48 = 21,722/x
  3. Step 3: Cross multiply
    87,386x = 131,079.48 × 21,722
  4. Step 4: Simplify right side
    87,386x = 2,847,308,464.56
  5. Step 5: Solve for x
    x = 2,847,308,464.56/87,386
  6. Step 6: Final answer
    x = 32,583.12

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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.