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Finding the Fourth Proportional to 92.21, 138.30 and 31.38

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Solution

The fourth proportional to 92.21, 138.30 and 31.38 is: 47.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.21 : 138.30 = 31.38 : x
  2. Step 2: Convert to fraction form
    92.21/138.30 = 31.38/x
  3. Step 3: Cross multiply
    92.21x = 138.30 × 31.38
  4. Step 4: Simplify right side
    92.21x = 4,339.85
  5. Step 5: Solve for x
    x = 4,339.85/92.21
  6. Step 6: Final answer
    x = 47.06

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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.