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Finding the Third Proportional to 386.30 and 838.13

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Solution

The third proportional to 386.30 and 838.13 is: 1,818.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.30 : 838.13 = 838.13 : x
  2. Step 2: Convert to fraction form
    386.30/838.13 = 838.13/x
  3. Step 3: Cross multiply
    386.30x = 838.13 × 838.13
  4. Step 4: Simplify right side
    386.30x = 702,453.52
  5. Step 5: Solve for x
    x = 702,453.52/386.30
  6. Step 6: Final answer
    x = 1,818.43

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.