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Finding the Fourth Proportional to 330.12, 494.92 and 285

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Solution

The fourth proportional to 330.12, 494.92 and 285 is: 427.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.12 : 494.92 = 285 : x
  2. Step 2: Convert to fraction form
    330.12/494.92 = 285/x
  3. Step 3: Cross multiply
    330.12x = 494.92 × 285
  4. Step 4: Simplify right side
    330.12x = 141,052.20
  5. Step 5: Solve for x
    x = 141,052.20/330.12
  6. Step 6: Final answer
    x = 427.28

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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.