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Finding the Fourth Proportional to 187.97, 259.20 and 161.81

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Solution

The fourth proportional to 187.97, 259.20 and 161.81 is: 223.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    187.97 : 259.20 = 161.81 : x
  2. Step 2: Convert to fraction form
    187.97/259.20 = 161.81/x
  3. Step 3: Cross multiply
    187.97x = 259.20 × 161.81
  4. Step 4: Simplify right side
    187.97x = 41,942.29
  5. Step 5: Solve for x
    x = 41,942.29/187.97
  6. Step 6: Final answer
    x = 223.13

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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.