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Finding the Fourth Proportional to 324.97, 487.05 and 139.68

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Solution

The fourth proportional to 324.97, 487.05 and 139.68 is: 209.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.97 : 487.05 = 139.68 : x
  2. Step 2: Convert to fraction form
    324.97/487.05 = 139.68/x
  3. Step 3: Cross multiply
    324.97x = 487.05 × 139.68
  4. Step 4: Simplify right side
    324.97x = 68,031.14
  5. Step 5: Solve for x
    x = 68,031.14/324.97
  6. Step 6: Final answer
    x = 209.35

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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.