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Finding the Fourth Proportional to 161.79, 242.76 and 131.70

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Solution

The fourth proportional to 161.79, 242.76 and 131.70 is: 197.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.79 : 242.76 = 131.70 : x
  2. Step 2: Convert to fraction form
    161.79/242.76 = 131.70/x
  3. Step 3: Cross multiply
    161.79x = 242.76 × 131.70
  4. Step 4: Simplify right side
    161.79x = 31,971.49
  5. Step 5: Solve for x
    x = 31,971.49/161.79
  6. Step 6: Final answer
    x = 197.61

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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.