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Finding the Fourth Proportional to 87, 119.97 and 78.27

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Solution

The fourth proportional to 87, 119.97 and 78.27 is: 107.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    87 : 119.97 = 78.27 : x
  2. Step 2: Convert to fraction form
    87/119.97 = 78.27/x
  3. Step 3: Cross multiply
    87x = 119.97 × 78.27
  4. Step 4: Simplify right side
    87x = 9,390.05
  5. Step 5: Solve for x
    x = 9,390.05/87
  6. Step 6: Final answer
    x = 107.93

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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.