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Finding the Fourth Proportional to 119.84, 165.44 and 83.20

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Solution

The fourth proportional to 119.84, 165.44 and 83.20 is: 114.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.84 : 165.44 = 83.20 : x
  2. Step 2: Convert to fraction form
    119.84/165.44 = 83.20/x
  3. Step 3: Cross multiply
    119.84x = 165.44 × 83.20
  4. Step 4: Simplify right side
    119.84x = 13,764.61
  5. Step 5: Solve for x
    x = 13,764.61/119.84
  6. Step 6: Final answer
    x = 114.86

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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.