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Finding the Fourth Proportional to 181.28, 271.93 and 78.56

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Solution

The fourth proportional to 181.28, 271.93 and 78.56 is: 117.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.28 : 271.93 = 78.56 : x
  2. Step 2: Convert to fraction form
    181.28/271.93 = 78.56/x
  3. Step 3: Cross multiply
    181.28x = 271.93 × 78.56
  4. Step 4: Simplify right side
    181.28x = 21,361.66
  5. Step 5: Solve for x
    x = 21,361.66/181.28
  6. Step 6: Final answer
    x = 117.84

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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.