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Finding the Fourth Proportional to 171.25, 235.91 and 143.78

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Solution

The fourth proportional to 171.25, 235.91 and 143.78 is: 198.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.25 : 235.91 = 143.78 : x
  2. Step 2: Convert to fraction form
    171.25/235.91 = 143.78/x
  3. Step 3: Cross multiply
    171.25x = 235.91 × 143.78
  4. Step 4: Simplify right side
    171.25x = 33,918.32
  5. Step 5: Solve for x
    x = 33,918.32/171.25
  6. Step 6: Final answer
    x = 198.07

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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.