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Finding the Fourth Proportional to 161.70, 242.46 and 84.60

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Solution

The fourth proportional to 161.70, 242.46 and 84.60 is: 126.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.70 : 242.46 = 84.60 : x
  2. Step 2: Convert to fraction form
    161.70/242.46 = 84.60/x
  3. Step 3: Cross multiply
    161.70x = 242.46 × 84.60
  4. Step 4: Simplify right side
    161.70x = 20,512.12
  5. Step 5: Solve for x
    x = 20,512.12/161.70
  6. Step 6: Final answer
    x = 126.85

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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.