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Finding the Fourth Proportional to 49.45, 68.31 and 49.11

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Solution

The fourth proportional to 49.45, 68.31 and 49.11 is: 67.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.45 : 68.31 = 49.11 : x
  2. Step 2: Convert to fraction form
    49.45/68.31 = 49.11/x
  3. Step 3: Cross multiply
    49.45x = 68.31 × 49.11
  4. Step 4: Simplify right side
    49.45x = 3,354.26
  5. Step 5: Solve for x
    x = 3,354.26/49.45
  6. Step 6: Final answer
    x = 67.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.