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Finding the Fourth Proportional to 171.70, 236.97 and 105.31

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Solution

The fourth proportional to 171.70, 236.97 and 105.31 is: 145.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.70 : 236.97 = 105.31 : x
  2. Step 2: Convert to fraction form
    171.70/236.97 = 105.31/x
  3. Step 3: Cross multiply
    171.70x = 236.97 × 105.31
  4. Step 4: Simplify right side
    171.70x = 24,955.31
  5. Step 5: Solve for x
    x = 24,955.31/171.70
  6. Step 6: Final answer
    x = 145.34

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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.