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Finding the Fourth Proportional to 181.92, 272.64 and 90.64

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Solution

The fourth proportional to 181.92, 272.64 and 90.64 is: 135.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.92 : 272.64 = 90.64 : x
  2. Step 2: Convert to fraction form
    181.92/272.64 = 90.64/x
  3. Step 3: Cross multiply
    181.92x = 272.64 × 90.64
  4. Step 4: Simplify right side
    181.92x = 24,712.09
  5. Step 5: Solve for x
    x = 24,712.09/181.92
  6. Step 6: Final answer
    x = 135.84

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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.