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Finding the Third Proportional to 318.94 and 686.81

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Solution

The third proportional to 318.94 and 686.81 is: 1,479.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.94 : 686.81 = 686.81 : x
  2. Step 2: Convert to fraction form
    318.94/686.81 = 686.81/x
  3. Step 3: Cross multiply
    318.94x = 686.81 × 686.81
  4. Step 4: Simplify right side
    318.94x = 471,711.41
  5. Step 5: Solve for x
    x = 471,711.41/318.94
  6. Step 6: Final answer
    x = 1,479.01

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.