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Finding the Fourth Proportional to 181.89, 272.84 and 128.43

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Solution

The fourth proportional to 181.89, 272.84 and 128.43 is: 192.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.89 : 272.84 = 128.43 : x
  2. Step 2: Convert to fraction form
    181.89/272.84 = 128.43/x
  3. Step 3: Cross multiply
    181.89x = 272.84 × 128.43
  4. Step 4: Simplify right side
    181.89x = 35,040.20
  5. Step 5: Solve for x
    x = 35,040.20/181.89
  6. Step 6: Final answer
    x = 192.65

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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.