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Finding the Fourth Proportional to 171.90, 258.01 and 79.39

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Solution

The fourth proportional to 171.90, 258.01 and 79.39 is: 119.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.90 : 258.01 = 79.39 : x
  2. Step 2: Convert to fraction form
    171.90/258.01 = 79.39/x
  3. Step 3: Cross multiply
    171.90x = 258.01 × 79.39
  4. Step 4: Simplify right side
    171.90x = 20,483.54
  5. Step 5: Solve for x
    x = 20,483.54/171.90
  6. Step 6: Final answer
    x = 119.16

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.