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Finding the Fourth Proportional to 181.86, 251 and 128.77

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Solution

The fourth proportional to 181.86, 251 and 128.77 is: 177.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.86 : 251 = 128.77 : x
  2. Step 2: Convert to fraction form
    181.86/251 = 128.77/x
  3. Step 3: Cross multiply
    181.86x = 251 × 128.77
  4. Step 4: Simplify right side
    181.86x = 32,321.27
  5. Step 5: Solve for x
    x = 32,321.27/181.86
  6. Step 6: Final answer
    x = 177.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.