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Finding the Fourth Proportional to 165.05, 247.34 and 83.92

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Solution

The fourth proportional to 165.05, 247.34 and 83.92 is: 125.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    165.05 : 247.34 = 83.92 : x
  2. Step 2: Convert to fraction form
    165.05/247.34 = 83.92/x
  3. Step 3: Cross multiply
    165.05x = 247.34 × 83.92
  4. Step 4: Simplify right side
    165.05x = 20,755.12
  5. Step 5: Solve for x
    x = 20,755.12/165.05
  6. Step 6: Final answer
    x = 125.75

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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.