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Finding the Fourth Proportional to 188.78, 259.94 and 188.17

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Solution

The fourth proportional to 188.78, 259.94 and 188.17 is: 259.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.78 : 259.94 = 188.17 : x
  2. Step 2: Convert to fraction form
    188.78/259.94 = 188.17/x
  3. Step 3: Cross multiply
    188.78x = 259.94 × 188.17
  4. Step 4: Simplify right side
    188.78x = 48,912.73
  5. Step 5: Solve for x
    x = 48,912.73/188.78
  6. Step 6: Final answer
    x = 259.11

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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.