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Finding the Fourth Proportional to 85, 127.41 and 48.91

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Solution

The fourth proportional to 85, 127.41 and 48.91 is: 73.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    85 : 127.41 = 48.91 : x
  2. Step 2: Convert to fraction form
    85/127.41 = 48.91/x
  3. Step 3: Cross multiply
    85x = 127.41 × 48.91
  4. Step 4: Simplify right side
    85x = 6,231.62
  5. Step 5: Solve for x
    x = 6,231.62/85
  6. Step 6: Final answer
    x = 73.31

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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.