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Finding the Fourth Proportional to 120, 165.51 and 83.22

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Solution

The fourth proportional to 120, 165.51 and 83.22 is: 114.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    120 : 165.51 = 83.22 : x
  2. Step 2: Convert to fraction form
    120/165.51 = 83.22/x
  3. Step 3: Cross multiply
    120x = 165.51 × 83.22
  4. Step 4: Simplify right side
    120x = 13,773.74
  5. Step 5: Solve for x
    x = 13,773.74/120
  6. Step 6: Final answer
    x = 114.78

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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.