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Finding the Fourth Proportional to 49.81, 68.73 and 28.81

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Solution

The fourth proportional to 49.81, 68.73 and 28.81 is: 39.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.81 : 68.73 = 28.81 : x
  2. Step 2: Convert to fraction form
    49.81/68.73 = 28.81/x
  3. Step 3: Cross multiply
    49.81x = 68.73 × 28.81
  4. Step 4: Simplify right side
    49.81x = 1,979.86
  5. Step 5: Solve for x
    x = 1,979.86/49.81
  6. Step 6: Final answer
    x = 39.75

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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.