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Finding the Fourth Proportional to 161.48, 242.70 and 129.56

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Solution

The fourth proportional to 161.48, 242.70 and 129.56 is: 194.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.48 : 242.70 = 129.56 : x
  2. Step 2: Convert to fraction form
    161.48/242.70 = 129.56/x
  3. Step 3: Cross multiply
    161.48x = 242.70 × 129.56
  4. Step 4: Simplify right side
    161.48x = 31,444.21
  5. Step 5: Solve for x
    x = 31,444.21/161.48
  6. Step 6: Final answer
    x = 194.73

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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.