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Finding the Fourth Proportional to 127.76, 174.96 and 121.59

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Solution

The fourth proportional to 127.76, 174.96 and 121.59 is: 166.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    127.76 : 174.96 = 121.59 : x
  2. Step 2: Convert to fraction form
    127.76/174.96 = 121.59/x
  3. Step 3: Cross multiply
    127.76x = 174.96 × 121.59
  4. Step 4: Simplify right side
    127.76x = 21,273.39
  5. Step 5: Solve for x
    x = 21,273.39/127.76
  6. Step 6: Final answer
    x = 166.52

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.