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Finding the Fourth Proportional to 120.12, 165.95 and 102.82

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Solution

The fourth proportional to 120.12, 165.95 and 102.82 is: 142.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    120.12 : 165.95 = 102.82 : x
  2. Step 2: Convert to fraction form
    120.12/165.95 = 102.82/x
  3. Step 3: Cross multiply
    120.12x = 165.95 × 102.82
  4. Step 4: Simplify right side
    120.12x = 17,062.75
  5. Step 5: Solve for x
    x = 17,062.75/120.12
  6. Step 6: Final answer
    x = 142.04

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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.