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Finding the Third Proportional to 386.13 and 515.63

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Solution

The third proportional to 386.13 and 515.63 is: 688.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.13 : 515.63 = 515.63 : x
  2. Step 2: Convert to fraction form
    386.13/515.63 = 515.63/x
  3. Step 3: Cross multiply
    386.13x = 515.63 × 515.63
  4. Step 4: Simplify right side
    386.13x = 265,869.14
  5. Step 5: Solve for x
    x = 265,869.14/386.13
  6. Step 6: Final answer
    x = 688.56

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.