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Finding the Fourth Proportional to 171.69, 236.91 and 109.45

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Solution

The fourth proportional to 171.69, 236.91 and 109.45 is: 151.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.69 : 236.91 = 109.45 : x
  2. Step 2: Convert to fraction form
    171.69/236.91 = 109.45/x
  3. Step 3: Cross multiply
    171.69x = 236.91 × 109.45
  4. Step 4: Simplify right side
    171.69x = 25,929.80
  5. Step 5: Solve for x
    x = 25,929.80/171.69
  6. Step 6: Final answer
    x = 151.03

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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.