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Finding the Third Proportional to 398.25 and 830.25

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Solution

The third proportional to 398.25 and 830.25 is: 1,730.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.25 : 830.25 = 830.25 : x
  2. Step 2: Convert to fraction form
    398.25/830.25 = 830.25/x
  3. Step 3: Cross multiply
    398.25x = 830.25 × 830.25
  4. Step 4: Simplify right side
    398.25x = 689,315.06
  5. Step 5: Solve for x
    x = 689,315.06/398.25
  6. Step 6: Final answer
    x = 1,730.86

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Why These Related Problems?

These problems maintain the same ratio (2.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.