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Finding the Fourth Proportional to 324.18, 486.40 and 141.48

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Solution

The fourth proportional to 324.18, 486.40 and 141.48 is: 212.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.18 : 486.40 = 141.48 : x
  2. Step 2: Convert to fraction form
    324.18/486.40 = 141.48/x
  3. Step 3: Cross multiply
    324.18x = 486.40 × 141.48
  4. Step 4: Simplify right side
    324.18x = 68,815.87
  5. Step 5: Solve for x
    x = 68,815.87/324.18
  6. Step 6: Final answer
    x = 212.28

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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.