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Finding the Fourth Proportional to 161.45, 222.93 and 129.05

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Solution

The fourth proportional to 161.45, 222.93 and 129.05 is: 178.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.45 : 222.93 = 129.05 : x
  2. Step 2: Convert to fraction form
    161.45/222.93 = 129.05/x
  3. Step 3: Cross multiply
    161.45x = 222.93 × 129.05
  4. Step 4: Simplify right side
    161.45x = 28,769.12
  5. Step 5: Solve for x
    x = 28,769.12/161.45
  6. Step 6: Final answer
    x = 178.19

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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.