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Finding the Fourth Proportional to 151.30, 209.75 and 143.09

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Solution

The fourth proportional to 151.30, 209.75 and 143.09 is: 198.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.30 : 209.75 = 143.09 : x
  2. Step 2: Convert to fraction form
    151.30/209.75 = 143.09/x
  3. Step 3: Cross multiply
    151.30x = 209.75 × 143.09
  4. Step 4: Simplify right side
    151.30x = 30,013.13
  5. Step 5: Solve for x
    x = 30,013.13/151.30
  6. Step 6: Final answer
    x = 198.37

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.