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Finding the Third Proportional to 78.19 and 122.06

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Solution

The third proportional to 78.19 and 122.06 is: 190.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.19 : 122.06 = 122.06 : x
  2. Step 2: Convert to fraction form
    78.19/122.06 = 122.06/x
  3. Step 3: Cross multiply
    78.19x = 122.06 × 122.06
  4. Step 4: Simplify right side
    78.19x = 14,899.25
  5. Step 5: Solve for x
    x = 14,899.25/78.19
  6. Step 6: Final answer
    x = 190.56

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.