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Finding the Fourth Proportional to 151.15, 208.31 and 143.18

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Solution

The fourth proportional to 151.15, 208.31 and 143.18 is: 197.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    151.15 : 208.31 = 143.18 : x
  2. Step 2: Convert to fraction form
    151.15/208.31 = 143.18/x
  3. Step 3: Cross multiply
    151.15x = 208.31 × 143.18
  4. Step 4: Simplify right side
    151.15x = 29,825.83
  5. Step 5: Solve for x
    x = 29,825.83/151.15
  6. Step 6: Final answer
    x = 197.33

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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.