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Finding the Third Proportional to 218,746 and 312,806

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Solution

The third proportional to 218,746 and 312,806 is: 447,311.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    218,746 : 312,806 = 312,806 : x
  2. Step 2: Convert to fraction form
    218,746/312,806 = 312,806/x
  3. Step 3: Cross multiply
    218,746x = 312,806 × 312,806
  4. Step 4: Simplify right side
    218,746x = 97,847,593,636
  5. Step 5: Solve for x
    x = 97,847,593,636/218,746
  6. Step 6: Final answer
    x = 447,311.46

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.