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Finding the Fourth Proportional to 330.23, 494.57 and 261.29

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Solution

The fourth proportional to 330.23, 494.57 and 261.29 is: 391.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.23 : 494.57 = 261.29 : x
  2. Step 2: Convert to fraction form
    330.23/494.57 = 261.29/x
  3. Step 3: Cross multiply
    330.23x = 494.57 × 261.29
  4. Step 4: Simplify right side
    330.23x = 129,226.20
  5. Step 5: Solve for x
    x = 129,226.20/330.23
  6. Step 6: Final answer
    x = 391.32

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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.