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Finding the Fourth Proportional to 161.52, 242.39 and 120.81

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Solution

The fourth proportional to 161.52, 242.39 and 120.81 is: 181.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.52 : 242.39 = 120.81 : x
  2. Step 2: Convert to fraction form
    161.52/242.39 = 120.81/x
  3. Step 3: Cross multiply
    161.52x = 242.39 × 120.81
  4. Step 4: Simplify right side
    161.52x = 29,284.35
  5. Step 5: Solve for x
    x = 29,284.35/161.52
  6. Step 6: Final answer
    x = 181.31

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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.