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Finding the Fourth Proportional to 119.89, 165.48 and 70.79

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Solution

The fourth proportional to 119.89, 165.48 and 70.79 is: 97.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    119.89 : 165.48 = 70.79 : x
  2. Step 2: Convert to fraction form
    119.89/165.48 = 70.79/x
  3. Step 3: Cross multiply
    119.89x = 165.48 × 70.79
  4. Step 4: Simplify right side
    119.89x = 11,714.33
  5. Step 5: Solve for x
    x = 11,714.33/119.89
  6. Step 6: Final answer
    x = 97.71

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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.