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Finding the Fourth Proportional to 163.24, 243.65 and 142.72

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Solution

The fourth proportional to 163.24, 243.65 and 142.72 is: 213.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.24 : 243.65 = 142.72 : x
  2. Step 2: Convert to fraction form
    163.24/243.65 = 142.72/x
  3. Step 3: Cross multiply
    163.24x = 243.65 × 142.72
  4. Step 4: Simplify right side
    163.24x = 34,773.48
  5. Step 5: Solve for x
    x = 34,773.48/163.24
  6. Step 6: Final answer
    x = 213.02

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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.