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Finding the Fourth Proportional to 85.06, 127.59 and 30.92

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Solution

The fourth proportional to 85.06, 127.59 and 30.92 is: 46.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    85.06 : 127.59 = 30.92 : x
  2. Step 2: Convert to fraction form
    85.06/127.59 = 30.92/x
  3. Step 3: Cross multiply
    85.06x = 127.59 × 30.92
  4. Step 4: Simplify right side
    85.06x = 3,945.40
  5. Step 5: Solve for x
    x = 3,945.40/85.06
  6. Step 6: Final answer
    x = 46.39

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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.