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Finding the Fourth Proportional to 85.00, 127.44 and 27.20

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Solution

The fourth proportional to 85.00, 127.44 and 27.20 is: 40.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.00 : 127.44 = 27.20 : x
  2. Step 2: Convert to fraction form
    85.00/127.44 = 27.20/x
  3. Step 3: Cross multiply
    85.00x = 127.44 × 27.20
  4. Step 4: Simplify right side
    85.00x = 3,465.80
  5. Step 5: Solve for x
    x = 3,465.80/85.00
  6. Step 6: Final answer
    x = 40.78

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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.