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Finding the Fourth Proportional to 324.12, 441.66 and 316.61

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Solution

The fourth proportional to 324.12, 441.66 and 316.61 is: 431.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.12 : 441.66 = 316.61 : x
  2. Step 2: Convert to fraction form
    324.12/441.66 = 316.61/x
  3. Step 3: Cross multiply
    324.12x = 441.66 × 316.61
  4. Step 4: Simplify right side
    324.12x = 139,831.76
  5. Step 5: Solve for x
    x = 139,831.76/324.12
  6. Step 6: Final answer
    x = 431.42

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.