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Finding the Fourth Proportional to 120.14, 165.76 and 68.39

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Solution

The fourth proportional to 120.14, 165.76 and 68.39 is: 94.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.14 : 165.76 = 68.39 : x
  2. Step 2: Convert to fraction form
    120.14/165.76 = 68.39/x
  3. Step 3: Cross multiply
    120.14x = 165.76 × 68.39
  4. Step 4: Simplify right side
    120.14x = 11,336.33
  5. Step 5: Solve for x
    x = 11,336.33/120.14
  6. Step 6: Final answer
    x = 94.36

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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.