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Finding the Fourth Proportional to 119.73, 165.06 and 84.78

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Solution

The fourth proportional to 119.73, 165.06 and 84.78 is: 116.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.73 : 165.06 = 84.78 : x
  2. Step 2: Convert to fraction form
    119.73/165.06 = 84.78/x
  3. Step 3: Cross multiply
    119.73x = 165.06 × 84.78
  4. Step 4: Simplify right side
    119.73x = 13,993.79
  5. Step 5: Solve for x
    x = 13,993.79/119.73
  6. Step 6: Final answer
    x = 116.88

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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.