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Finding the Fourth Proportional to 181.78, 272.60 and 79

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Solution

The fourth proportional to 181.78, 272.60 and 79 is: 118.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.78 : 272.60 = 79 : x
  2. Step 2: Convert to fraction form
    181.78/272.60 = 79/x
  3. Step 3: Cross multiply
    181.78x = 272.60 × 79
  4. Step 4: Simplify right side
    181.78x = 21,535.40
  5. Step 5: Solve for x
    x = 21,535.40/181.78
  6. Step 6: Final answer
    x = 118.47

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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.