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Finding the Third Proportional to 386.44 and 505.69

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Solution

The third proportional to 386.44 and 505.69 is: 661.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.44 : 505.69 = 505.69 : x
  2. Step 2: Convert to fraction form
    386.44/505.69 = 505.69/x
  3. Step 3: Cross multiply
    386.44x = 505.69 × 505.69
  4. Step 4: Simplify right side
    386.44x = 255,719.85
  5. Step 5: Solve for x
    x = 255,719.85/386.44
  6. Step 6: Final answer
    x = 661.74

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.