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Finding the Fourth Proportional to 161.65, 242.68 and 84.67

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Solution

The fourth proportional to 161.65, 242.68 and 84.67 is: 127.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.65 : 242.68 = 84.67 : x
  2. Step 2: Convert to fraction form
    161.65/242.68 = 84.67/x
  3. Step 3: Cross multiply
    161.65x = 242.68 × 84.67
  4. Step 4: Simplify right side
    161.65x = 20,546.50
  5. Step 5: Solve for x
    x = 20,546.50/161.65
  6. Step 6: Final answer
    x = 127.11

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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.