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Finding the Fourth Proportional to 324.80, 487.43 and 187.66

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Solution

The fourth proportional to 324.80, 487.43 and 187.66 is: 281.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    324.80 : 487.43 = 187.66 : x
  2. Step 2: Convert to fraction form
    324.80/487.43 = 187.66/x
  3. Step 3: Cross multiply
    324.80x = 487.43 × 187.66
  4. Step 4: Simplify right side
    324.80x = 91,471.49
  5. Step 5: Solve for x
    x = 91,471.49/324.80
  6. Step 6: Final answer
    x = 281.63

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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.