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Finding the Fourth Proportional to 339.28, 469.17 and 324.79

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Solution

The fourth proportional to 339.28, 469.17 and 324.79 is: 449.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    339.28 : 469.17 = 324.79 : x
  2. Step 2: Convert to fraction form
    339.28/469.17 = 324.79/x
  3. Step 3: Cross multiply
    339.28x = 469.17 × 324.79
  4. Step 4: Simplify right side
    339.28x = 152,381.72
  5. Step 5: Solve for x
    x = 152,381.72/339.28
  6. Step 6: Final answer
    x = 449.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.