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Finding the Fourth Proportional to 49.21, 67.94 and 38.70

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Solution

The fourth proportional to 49.21, 67.94 and 38.70 is: 53.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.21 : 67.94 = 38.70 : x
  2. Step 2: Convert to fraction form
    49.21/67.94 = 38.70/x
  3. Step 3: Cross multiply
    49.21x = 67.94 × 38.70
  4. Step 4: Simplify right side
    49.21x = 2,629.28
  5. Step 5: Solve for x
    x = 2,629.28/49.21
  6. Step 6: Final answer
    x = 53.43

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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.