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Finding the Fourth Proportional to 163.60, 225.65 and 103.76

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Solution

The fourth proportional to 163.60, 225.65 and 103.76 is: 143.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    163.60 : 225.65 = 103.76 : x
  2. Step 2: Convert to fraction form
    163.60/225.65 = 103.76/x
  3. Step 3: Cross multiply
    163.60x = 225.65 × 103.76
  4. Step 4: Simplify right side
    163.60x = 23,414.27
  5. Step 5: Solve for x
    x = 23,414.27/163.60
  6. Step 6: Final answer
    x = 143.12

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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.