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Finding the Fourth Proportional to 119.81, 165.37 and 70.72

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Solution

The fourth proportional to 119.81, 165.37 and 70.72 is: 97.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.81 : 165.37 = 70.72 : x
  2. Step 2: Convert to fraction form
    119.81/165.37 = 70.72/x
  3. Step 3: Cross multiply
    119.81x = 165.37 × 70.72
  4. Step 4: Simplify right side
    119.81x = 11,694.38
  5. Step 5: Solve for x
    x = 11,694.38/119.81
  6. Step 6: Final answer
    x = 97.61

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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.