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Finding the Fourth Proportional to 330, 492.80 and 269

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Solution

The fourth proportional to 330, 492.80 and 269 is: 401.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    330 : 492.80 = 269 : x
  2. Step 2: Convert to fraction form
    330/492.80 = 269/x
  3. Step 3: Cross multiply
    330x = 492.80 × 269
  4. Step 4: Simplify right side
    330x = 132,563.20
  5. Step 5: Solve for x
    x = 132,563.20/330
  6. Step 6: Final answer
    x = 401.71

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.