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Finding the Fourth Proportional to 151.75, 209.44 and 92.78

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Solution

The fourth proportional to 151.75, 209.44 and 92.78 is: 128.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.75 : 209.44 = 92.78 : x
  2. Step 2: Convert to fraction form
    151.75/209.44 = 92.78/x
  3. Step 3: Cross multiply
    151.75x = 209.44 × 92.78
  4. Step 4: Simplify right side
    151.75x = 19,431.14
  5. Step 5: Solve for x
    x = 19,431.14/151.75
  6. Step 6: Final answer
    x = 128.04

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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.