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Finding the Fourth Proportional to 181.28, 272.08 and 85.12

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Solution

The fourth proportional to 181.28, 272.08 and 85.12 is: 127.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.28 : 272.08 = 85.12 : x
  2. Step 2: Convert to fraction form
    181.28/272.08 = 85.12/x
  3. Step 3: Cross multiply
    181.28x = 272.08 × 85.12
  4. Step 4: Simplify right side
    181.28x = 23,159.45
  5. Step 5: Solve for x
    x = 23,159.45/181.28
  6. Step 6: Final answer
    x = 127.76

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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.