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Finding the Fourth Proportional to 161.59, 222.99 and 87.90

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Solution

The fourth proportional to 161.59, 222.99 and 87.90 is: 121.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.59 : 222.99 = 87.90 : x
  2. Step 2: Convert to fraction form
    161.59/222.99 = 87.90/x
  3. Step 3: Cross multiply
    161.59x = 222.99 × 87.90
  4. Step 4: Simplify right side
    161.59x = 19,601.78
  5. Step 5: Solve for x
    x = 19,601.78/161.59
  6. Step 6: Final answer
    x = 121.31

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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.