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Finding the Fourth Proportional to 324.80, 486.84 and 132.40

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Solution

The fourth proportional to 324.80, 486.84 and 132.40 is: 198.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.80 : 486.84 = 132.40 : x
  2. Step 2: Convert to fraction form
    324.80/486.84 = 132.40/x
  3. Step 3: Cross multiply
    324.80x = 486.84 × 132.40
  4. Step 4: Simplify right side
    324.80x = 64,457.62
  5. Step 5: Solve for x
    x = 64,457.62/324.80
  6. Step 6: Final answer
    x = 198.45

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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.