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Finding the Fourth Proportional to 148.65, 222.85 and 90.80

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Solution

The fourth proportional to 148.65, 222.85 and 90.80 is: 136.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.65 : 222.85 = 90.80 : x
  2. Step 2: Convert to fraction form
    148.65/222.85 = 90.80/x
  3. Step 3: Cross multiply
    148.65x = 222.85 × 90.80
  4. Step 4: Simplify right side
    148.65x = 20,234.78
  5. Step 5: Solve for x
    x = 20,234.78/148.65
  6. Step 6: Final answer
    x = 136.12

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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.