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Finding the Fourth Proportional to 163.97, 245.78 and 72.57

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Solution

The fourth proportional to 163.97, 245.78 and 72.57 is: 108.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.97 : 245.78 = 72.57 : x
  2. Step 2: Convert to fraction form
    163.97/245.78 = 72.57/x
  3. Step 3: Cross multiply
    163.97x = 245.78 × 72.57
  4. Step 4: Simplify right side
    163.97x = 17,837.49
  5. Step 5: Solve for x
    x = 17,837.49/163.97
  6. Step 6: Final answer
    x = 108.79

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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.