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Finding the Fourth Proportional to 188, 281.78 and 115.64

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Solution

The fourth proportional to 188, 281.78 and 115.64 is: 173.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    188 : 281.78 = 115.64 : x
  2. Step 2: Convert to fraction form
    188/281.78 = 115.64/x
  3. Step 3: Cross multiply
    188x = 281.78 × 115.64
  4. Step 4: Simplify right side
    188x = 32,585.04
  5. Step 5: Solve for x
    x = 32,585.04/188
  6. Step 6: Final answer
    x = 173.32

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.