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Finding the Fourth Proportional to 331.50, 496.90 and 169.20

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Solution

The fourth proportional to 331.50, 496.90 and 169.20 is: 253.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.50 : 496.90 = 169.20 : x
  2. Step 2: Convert to fraction form
    331.50/496.90 = 169.20/x
  3. Step 3: Cross multiply
    331.50x = 496.90 × 169.20
  4. Step 4: Simplify right side
    331.50x = 84,075.69
  5. Step 5: Solve for x
    x = 84,075.69/331.50
  6. Step 6: Final answer
    x = 253.62

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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.