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Finding the Fourth Proportional to 439.72, 661.17 and 336.29

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Solution

The fourth proportional to 439.72, 661.17 and 336.29 is: 505.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.72 : 661.17 = 336.29 : x
  2. Step 2: Convert to fraction form
    439.72/661.17 = 336.29/x
  3. Step 3: Cross multiply
    439.72x = 661.17 × 336.29
  4. Step 4: Simplify right side
    439.72x = 222,344.86
  5. Step 5: Solve for x
    x = 222,344.86/439.72
  6. Step 6: Final answer
    x = 505.65

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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.