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Finding the Fourth Proportional to 324.32, 447.17 and 306.99

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Solution

The fourth proportional to 324.32, 447.17 and 306.99 is: 423.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.32 : 447.17 = 306.99 : x
  2. Step 2: Convert to fraction form
    324.32/447.17 = 306.99/x
  3. Step 3: Cross multiply
    324.32x = 447.17 × 306.99
  4. Step 4: Simplify right side
    324.32x = 137,275.18
  5. Step 5: Solve for x
    x = 137,275.18/324.32
  6. Step 6: Final answer
    x = 423.28

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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.