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Finding the Third Proportional to 426.94 and 678.87

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Solution

The third proportional to 426.94 and 678.87 is: 1,079.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.94 : 678.87 = 678.87 : x
  2. Step 2: Convert to fraction form
    426.94/678.87 = 678.87/x
  3. Step 3: Cross multiply
    426.94x = 678.87 × 678.87
  4. Step 4: Simplify right side
    426.94x = 460,860.66
  5. Step 5: Solve for x
    x = 460,860.66/426.94
  6. Step 6: Final answer
    x = 1,079.46

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.