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Finding the Fourth Proportional to 181.57, 272.38 and 85.38

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Solution

The fourth proportional to 181.57, 272.38 and 85.38 is: 128.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.57 : 272.38 = 85.38 : x
  2. Step 2: Convert to fraction form
    181.57/272.38 = 85.38/x
  3. Step 3: Cross multiply
    181.57x = 272.38 × 85.38
  4. Step 4: Simplify right side
    181.57x = 23,254.44
  5. Step 5: Solve for x
    x = 23,254.44/181.57
  6. Step 6: Final answer
    x = 128.08

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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.