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Finding the Fourth Proportional to 63.91, 95.70 and 38.11

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Solution

The fourth proportional to 63.91, 95.70 and 38.11 is: 57.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    63.91 : 95.70 = 38.11 : x
  2. Step 2: Convert to fraction form
    63.91/95.70 = 38.11/x
  3. Step 3: Cross multiply
    63.91x = 95.70 × 38.11
  4. Step 4: Simplify right side
    63.91x = 3,647.37
  5. Step 5: Solve for x
    x = 3,647.37/63.91
  6. Step 6: Final answer
    x = 57.07

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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.