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Finding the Fourth Proportional to 163.90, 245.67 and 67.66

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Solution

The fourth proportional to 163.90, 245.67 and 67.66 is: 101.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.90 : 245.67 = 67.66 : x
  2. Step 2: Convert to fraction form
    163.90/245.67 = 67.66/x
  3. Step 3: Cross multiply
    163.90x = 245.67 × 67.66
  4. Step 4: Simplify right side
    163.90x = 16,622.03
  5. Step 5: Solve for x
    x = 16,622.03/163.90
  6. Step 6: Final answer
    x = 101.42

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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.