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Finding the Fourth Proportional to 324.72, 486.57 and 141.78

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Solution

The fourth proportional to 324.72, 486.57 and 141.78 is: 212.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.72 : 486.57 = 141.78 : x
  2. Step 2: Convert to fraction form
    324.72/486.57 = 141.78/x
  3. Step 3: Cross multiply
    324.72x = 486.57 × 141.78
  4. Step 4: Simplify right side
    324.72x = 68,985.89
  5. Step 5: Solve for x
    x = 68,985.89/324.72
  6. Step 6: Final answer
    x = 212.45

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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.