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Finding the Fourth Proportional to 161.11, 241.56 and 79.87

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Solution

The fourth proportional to 161.11, 241.56 and 79.87 is: 119.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.11 : 241.56 = 79.87 : x
  2. Step 2: Convert to fraction form
    161.11/241.56 = 79.87/x
  3. Step 3: Cross multiply
    161.11x = 241.56 × 79.87
  4. Step 4: Simplify right side
    161.11x = 19,293.40
  5. Step 5: Solve for x
    x = 19,293.40/161.11
  6. Step 6: Final answer
    x = 119.75

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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.