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Finding the Fourth Proportional to 161.82, 242.64 and 121.32

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Solution

The fourth proportional to 161.82, 242.64 and 121.32 is: 181.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.82 : 242.64 = 121.32 : x
  2. Step 2: Convert to fraction form
    161.82/242.64 = 121.32/x
  3. Step 3: Cross multiply
    161.82x = 242.64 × 121.32
  4. Step 4: Simplify right side
    161.82x = 29,437.08
  5. Step 5: Solve for x
    x = 29,437.08/161.82
  6. Step 6: Final answer
    x = 181.91

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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.