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Finding the Third Proportional to 378.28 and 790.88

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Solution

The third proportional to 378.28 and 790.88 is: 1,653.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.28 : 790.88 = 790.88 : x
  2. Step 2: Convert to fraction form
    378.28/790.88 = 790.88/x
  3. Step 3: Cross multiply
    378.28x = 790.88 × 790.88
  4. Step 4: Simplify right side
    378.28x = 625,483.27
  5. Step 5: Solve for x
    x = 625,483.27/378.28
  6. Step 6: Final answer
    x = 1,653.49

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Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.