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Finding the Fourth Proportional to 107.82, 161.42 and 87.56

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Solution

The fourth proportional to 107.82, 161.42 and 87.56 is: 131.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    107.82 : 161.42 = 87.56 : x
  2. Step 2: Convert to fraction form
    107.82/161.42 = 87.56/x
  3. Step 3: Cross multiply
    107.82x = 161.42 × 87.56
  4. Step 4: Simplify right side
    107.82x = 14,133.94
  5. Step 5: Solve for x
    x = 14,133.94/107.82
  6. Step 6: Final answer
    x = 131.09

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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.