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Finding the Fourth Proportional to 181.68, 272.40 and 78.86

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Solution

The fourth proportional to 181.68, 272.40 and 78.86 is: 118.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.68 : 272.40 = 78.86 : x
  2. Step 2: Convert to fraction form
    181.68/272.40 = 78.86/x
  3. Step 3: Cross multiply
    181.68x = 272.40 × 78.86
  4. Step 4: Simplify right side
    181.68x = 21,480.10
  5. Step 5: Solve for x
    x = 21,480.10/181.68
  6. Step 6: Final answer
    x = 118.23

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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.