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Finding the Fourth Proportional to 163.48, 225.66 and 142.78

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Solution

The fourth proportional to 163.48, 225.66 and 142.78 is: 197.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.48 : 225.66 = 142.78 : x
  2. Step 2: Convert to fraction form
    163.48/225.66 = 142.78/x
  3. Step 3: Cross multiply
    163.48x = 225.66 × 142.78
  4. Step 4: Simplify right side
    163.48x = 32,219.73
  5. Step 5: Solve for x
    x = 32,219.73/163.48
  6. Step 6: Final answer
    x = 197.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.