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Finding the Third Proportional to 30.94 and 47.81

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Solution

The third proportional to 30.94 and 47.81 is: 73.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    30.94 : 47.81 = 47.81 : x
  2. Step 2: Convert to fraction form
    30.94/47.81 = 47.81/x
  3. Step 3: Cross multiply
    30.94x = 47.81 × 47.81
  4. Step 4: Simplify right side
    30.94x = 2,286.04
  5. Step 5: Solve for x
    x = 2,286.04/30.94
  6. Step 6: Final answer
    x = 73.89

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.