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Finding the Fourth Proportional to 188.30, 281.76 and 115.22

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Solution

The fourth proportional to 188.30, 281.76 and 115.22 is: 172.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    188.30 : 281.76 = 115.22 : x
  2. Step 2: Convert to fraction form
    188.30/281.76 = 115.22/x
  3. Step 3: Cross multiply
    188.30x = 281.76 × 115.22
  4. Step 4: Simplify right side
    188.30x = 32,464.39
  5. Step 5: Solve for x
    x = 32,464.39/188.30
  6. Step 6: Final answer
    x = 172.41

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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.