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Finding the Fourth Proportional to 161.53, 222.91 and 87.85

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Solution

The fourth proportional to 161.53, 222.91 and 87.85 is: 121.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.53 : 222.91 = 87.85 : x
  2. Step 2: Convert to fraction form
    161.53/222.91 = 87.85/x
  3. Step 3: Cross multiply
    161.53x = 222.91 × 87.85
  4. Step 4: Simplify right side
    161.53x = 19,582.64
  5. Step 5: Solve for x
    x = 19,582.64/161.53
  6. Step 6: Final answer
    x = 121.23

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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.