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Finding the Third Proportional to 313 and 678

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Solution

The third proportional to 313 and 678 is: 1,468.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    313 : 678 = 678 : x
  2. Step 2: Convert to fraction form
    313/678 = 678/x
  3. Step 3: Cross multiply
    313x = 678 × 678
  4. Step 4: Simplify right side
    313x = 459,684
  5. Step 5: Solve for x
    x = 459,684/313
  6. Step 6: Final answer
    x = 1,468.64

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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.