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Finding the Fourth Proportional to 188.69, 281.28 and 178.43

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Solution

The fourth proportional to 188.69, 281.28 and 178.43 is: 265.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.69 : 281.28 = 178.43 : x
  2. Step 2: Convert to fraction form
    188.69/281.28 = 178.43/x
  3. Step 3: Cross multiply
    188.69x = 281.28 × 178.43
  4. Step 4: Simplify right side
    188.69x = 50,188.79
  5. Step 5: Solve for x
    x = 50,188.79/188.69
  6. Step 6: Final answer
    x = 265.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.