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Finding the Third Proportional to 314.09 and 678.80

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Solution

The third proportional to 314.09 and 678.80 is: 1,467.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    314.09 : 678.80 = 678.80 : x
  2. Step 2: Convert to fraction form
    314.09/678.80 = 678.80/x
  3. Step 3: Cross multiply
    314.09x = 678.80 × 678.80
  4. Step 4: Simplify right side
    314.09x = 460,765.20
  5. Step 5: Solve for x
    x = 460,765.20/314.09
  6. Step 6: Final answer
    x = 1,467.00

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.