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Finding the Fourth Proportional to 181.95, 272.90 and 85.76

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Solution

The fourth proportional to 181.95, 272.90 and 85.76 is: 128.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.95 : 272.90 = 85.76 : x
  2. Step 2: Convert to fraction form
    181.95/272.90 = 85.76/x
  3. Step 3: Cross multiply
    181.95x = 272.90 × 85.76
  4. Step 4: Simplify right side
    181.95x = 23,403.90
  5. Step 5: Solve for x
    x = 23,403.90/181.95
  6. Step 6: Final answer
    x = 128.63

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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.