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Finding the Third Proportional to 378.42 and 784.69

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Solution

The third proportional to 378.42 and 784.69 is: 1,627.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.42 : 784.69 = 784.69 : x
  2. Step 2: Convert to fraction form
    378.42/784.69 = 784.69/x
  3. Step 3: Cross multiply
    378.42x = 784.69 × 784.69
  4. Step 4: Simplify right side
    378.42x = 615,734.47
  5. Step 5: Solve for x
    x = 615,734.47/378.42
  6. Step 6: Final answer
    x = 1,627.11

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Why These Related Problems?

These problems maintain the same ratio (2.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.