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Finding the Third Proportional to 308,916 and 721,715

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Solution

The third proportional to 308,916 and 721,715 is: 1,686,130.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    308,916 : 721,715 = 721,715 : x
  2. Step 2: Convert to fraction form
    308,916/721,715 = 721,715/x
  3. Step 3: Cross multiply
    308,916x = 721,715 × 721,715
  4. Step 4: Simplify right side
    308,916x = 520,872,541,225
  5. Step 5: Solve for x
    x = 520,872,541,225/308,916
  6. Step 6: Final answer
    x = 1,686,130.02

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Why These Related Problems?

These problems maintain the same ratio (2.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.