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Finding the Fourth Proportional to 161.43, 222.78 and 87.75

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Solution

The fourth proportional to 161.43, 222.78 and 87.75 is: 121.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.43 : 222.78 = 87.75 : x
  2. Step 2: Convert to fraction form
    161.43/222.78 = 87.75/x
  3. Step 3: Cross multiply
    161.43x = 222.78 × 87.75
  4. Step 4: Simplify right side
    161.43x = 19,548.95
  5. Step 5: Solve for x
    x = 19,548.95/161.43
  6. Step 6: Final answer
    x = 121.10

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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.