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Finding the Fourth Proportional to 181.65, 272.28 and 78.84

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Solution

The fourth proportional to 181.65, 272.28 and 78.84 is: 118.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.65 : 272.28 = 78.84 : x
  2. Step 2: Convert to fraction form
    181.65/272.28 = 78.84/x
  3. Step 3: Cross multiply
    181.65x = 272.28 × 78.84
  4. Step 4: Simplify right side
    181.65x = 21,466.56
  5. Step 5: Solve for x
    x = 21,466.56/181.65
  6. Step 6: Final answer
    x = 118.18

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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.