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Finding the Fourth Proportional to 181.31, 272.16 and 78.65

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Solution

The fourth proportional to 181.31, 272.16 and 78.65 is: 118.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.31 : 272.16 = 78.65 : x
  2. Step 2: Convert to fraction form
    181.31/272.16 = 78.65/x
  3. Step 3: Cross multiply
    181.31x = 272.16 × 78.65
  4. Step 4: Simplify right side
    181.31x = 21,404.02
  5. Step 5: Solve for x
    x = 21,404.02/181.31
  6. Step 6: Final answer
    x = 118.05

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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.