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Finding the Fourth Proportional to 49.64, 68.60 and 38.80

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Solution

The fourth proportional to 49.64, 68.60 and 38.80 is: 53.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.64 : 68.60 = 38.80 : x
  2. Step 2: Convert to fraction form
    49.64/68.60 = 38.80/x
  3. Step 3: Cross multiply
    49.64x = 68.60 × 38.80
  4. Step 4: Simplify right side
    49.64x = 2,661.68
  5. Step 5: Solve for x
    x = 2,661.68/49.64
  6. Step 6: Final answer
    x = 53.62

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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.