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Finding the Third Proportional to 47.75 and 78.94

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Solution

The third proportional to 47.75 and 78.94 is: 130.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    47.75 : 78.94 = 78.94 : x
  2. Step 2: Convert to fraction form
    47.75/78.94 = 78.94/x
  3. Step 3: Cross multiply
    47.75x = 78.94 × 78.94
  4. Step 4: Simplify right side
    47.75x = 6,231.13
  5. Step 5: Solve for x
    x = 6,231.13/47.75
  6. Step 6: Final answer
    x = 130.49

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.