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Finding the Fourth Proportional to 187.81, 258.89 and 143.73

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Solution

The fourth proportional to 187.81, 258.89 and 143.73 is: 198.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.81 : 258.89 = 143.73 : x
  2. Step 2: Convert to fraction form
    187.81/258.89 = 143.73/x
  3. Step 3: Cross multiply
    187.81x = 258.89 × 143.73
  4. Step 4: Simplify right side
    187.81x = 37,209.54
  5. Step 5: Solve for x
    x = 37,209.54/187.81
  6. Step 6: Final answer
    x = 198.13

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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.