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Finding the Fourth Proportional to 87.21, 120.38 and 68.82

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Solution

The fourth proportional to 87.21, 120.38 and 68.82 is: 94.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.21 : 120.38 = 68.82 : x
  2. Step 2: Convert to fraction form
    87.21/120.38 = 68.82/x
  3. Step 3: Cross multiply
    87.21x = 120.38 × 68.82
  4. Step 4: Simplify right side
    87.21x = 8,284.21
  5. Step 5: Solve for x
    x = 8,284.21/87.21
  6. Step 6: Final answer
    x = 94.99

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.