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Finding the Third Proportional to 291,275 and 393,531

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Solution

The third proportional to 291,275 and 393,531 is: 531,685.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    291,275 : 393,531 = 393,531 : x
  2. Step 2: Convert to fraction form
    291,275/393,531 = 393,531/x
  3. Step 3: Cross multiply
    291,275x = 393,531 × 393,531
  4. Step 4: Simplify right side
    291,275x = 154,866,647,961
  5. Step 5: Solve for x
    x = 154,866,647,961/291,275
  6. Step 6: Final answer
    x = 531,685.34

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.