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Finding the Fourth Proportional to 92.10, 138.12 and 46.44

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Solution

The fourth proportional to 92.10, 138.12 and 46.44 is: 69.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.10 : 138.12 = 46.44 : x
  2. Step 2: Convert to fraction form
    92.10/138.12 = 46.44/x
  3. Step 3: Cross multiply
    92.10x = 138.12 × 46.44
  4. Step 4: Simplify right side
    92.10x = 6,414.29
  5. Step 5: Solve for x
    x = 6,414.29/92.10
  6. Step 6: Final answer
    x = 69.64

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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.