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Finding the Third Proportional to 318,740 and 686,658

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Solution

The third proportional to 318,740 and 686,658 is: 1,479,259.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,740 : 686,658 = 686,658 : x
  2. Step 2: Convert to fraction form
    318,740/686,658 = 686,658/x
  3. Step 3: Cross multiply
    318,740x = 686,658 × 686,658
  4. Step 4: Simplify right side
    318,740x = 471,499,208,964
  5. Step 5: Solve for x
    x = 471,499,208,964/318,740
  6. Step 6: Final answer
    x = 1,479,259.61

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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.