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Finding the Third Proportional to 310.97 and 678.94

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Solution

The third proportional to 310.97 and 678.94 is: 1,482.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.97 : 678.94 = 678.94 : x
  2. Step 2: Convert to fraction form
    310.97/678.94 = 678.94/x
  3. Step 3: Cross multiply
    310.97x = 678.94 × 678.94
  4. Step 4: Simplify right side
    310.97x = 460,956.13
  5. Step 5: Solve for x
    x = 460,956.13/310.97
  6. Step 6: Final answer
    x = 1,482.32

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Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.