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Finding the Fourth Proportional to 163.42, 243.91 and 140.18

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Solution

The fourth proportional to 163.42, 243.91 and 140.18 is: 209.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.42 : 243.91 = 140.18 : x
  2. Step 2: Convert to fraction form
    163.42/243.91 = 140.18/x
  3. Step 3: Cross multiply
    163.42x = 243.91 × 140.18
  4. Step 4: Simplify right side
    163.42x = 34,191.63
  5. Step 5: Solve for x
    x = 34,191.63/163.42
  6. Step 6: Final answer
    x = 209.23

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.