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Finding the Fourth Proportional to 324.80, 486.76 and 142.35

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Solution

The fourth proportional to 324.80, 486.76 and 142.35 is: 213.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.80 : 486.76 = 142.35 : x
  2. Step 2: Convert to fraction form
    324.80/486.76 = 142.35/x
  3. Step 3: Cross multiply
    324.80x = 486.76 × 142.35
  4. Step 4: Simplify right side
    324.80x = 69,290.29
  5. Step 5: Solve for x
    x = 69,290.29/324.80
  6. Step 6: Final answer
    x = 213.33

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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.