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Finding the Fourth Proportional to 324.80, 487.16 and 108.40

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Solution

The fourth proportional to 324.80, 487.16 and 108.40 is: 162.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.80 : 487.16 = 108.40 : x
  2. Step 2: Convert to fraction form
    324.80/487.16 = 108.40/x
  3. Step 3: Cross multiply
    324.80x = 487.16 × 108.40
  4. Step 4: Simplify right side
    324.80x = 52,808.14
  5. Step 5: Solve for x
    x = 52,808.14/324.80
  6. Step 6: Final answer
    x = 162.59

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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.