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Finding the Fourth Proportional to 324.69, 486.86 and 287.72

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Solution

The fourth proportional to 324.69, 486.86 and 287.72 is: 431.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.69 : 486.86 = 287.72 : x
  2. Step 2: Convert to fraction form
    324.69/486.86 = 287.72/x
  3. Step 3: Cross multiply
    324.69x = 486.86 × 287.72
  4. Step 4: Simplify right side
    324.69x = 140,080.08
  5. Step 5: Solve for x
    x = 140,080.08/324.69
  6. Step 6: Final answer
    x = 431.43

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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.