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Finding the Fourth Proportional to 161.70, 242.56 and 121.15

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Solution

The fourth proportional to 161.70, 242.56 and 121.15 is: 181.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.70 : 242.56 = 121.15 : x
  2. Step 2: Convert to fraction form
    161.70/242.56 = 121.15/x
  3. Step 3: Cross multiply
    161.70x = 242.56 × 121.15
  4. Step 4: Simplify right side
    161.70x = 29,386.14
  5. Step 5: Solve for x
    x = 29,386.14/161.70
  6. Step 6: Final answer
    x = 181.73

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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.