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Finding the Fourth Proportional to 161.65, 223.07 and 87.96

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Solution

The fourth proportional to 161.65, 223.07 and 87.96 is: 121.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.65 : 223.07 = 87.96 : x
  2. Step 2: Convert to fraction form
    161.65/223.07 = 87.96/x
  3. Step 3: Cross multiply
    161.65x = 223.07 × 87.96
  4. Step 4: Simplify right side
    161.65x = 19,621.24
  5. Step 5: Solve for x
    x = 19,621.24/161.65
  6. Step 6: Final answer
    x = 121.38

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.