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Finding the Third Proportional to 315,860 and 690,770

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Solution

The third proportional to 315,860 and 690,770 is: 1,510,679.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    315,860 : 690,770 = 690,770 : x
  2. Step 2: Convert to fraction form
    315,860/690,770 = 690,770/x
  3. Step 3: Cross multiply
    315,860x = 690,770 × 690,770
  4. Step 4: Simplify right side
    315,860x = 477,163,192,900
  5. Step 5: Solve for x
    x = 477,163,192,900/315,860
  6. Step 6: Final answer
    x = 1,510,679.39

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.