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Finding the Fourth Proportional to 49.75, 74.70 and 47.81

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Solution

The fourth proportional to 49.75, 74.70 and 47.81 is: 71.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.75 : 74.70 = 47.81 : x
  2. Step 2: Convert to fraction form
    49.75/74.70 = 47.81/x
  3. Step 3: Cross multiply
    49.75x = 74.70 × 47.81
  4. Step 4: Simplify right side
    49.75x = 3,571.59
  5. Step 5: Solve for x
    x = 3,571.59/49.75
  6. Step 6: Final answer
    x = 71.79

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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.