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Finding the Fourth Proportional to 161.21, 242.34 and 129.11

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Solution

The fourth proportional to 161.21, 242.34 and 129.11 is: 194.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.21 : 242.34 = 129.11 : x
  2. Step 2: Convert to fraction form
    161.21/242.34 = 129.11/x
  3. Step 3: Cross multiply
    161.21x = 242.34 × 129.11
  4. Step 4: Simplify right side
    161.21x = 31,287.31
  5. Step 5: Solve for x
    x = 31,287.31/161.21
  6. Step 6: Final answer
    x = 194.08

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.