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Finding the Fourth Proportional to 151.27, 208.71 and 120.15

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Solution

The fourth proportional to 151.27, 208.71 and 120.15 is: 165.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.27 : 208.71 = 120.15 : x
  2. Step 2: Convert to fraction form
    151.27/208.71 = 120.15/x
  3. Step 3: Cross multiply
    151.27x = 208.71 × 120.15
  4. Step 4: Simplify right side
    151.27x = 25,076.51
  5. Step 5: Solve for x
    x = 25,076.51/151.27
  6. Step 6: Final answer
    x = 165.78

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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.