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Finding the Third Proportional to 318,160 and 686,140

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Solution

The third proportional to 318,160 and 686,140 is: 1,479,721.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,160 : 686,140 = 686,140 : x
  2. Step 2: Convert to fraction form
    318,160/686,140 = 686,140/x
  3. Step 3: Cross multiply
    318,160x = 686,140 × 686,140
  4. Step 4: Simplify right side
    318,160x = 470,788,099,600
  5. Step 5: Solve for x
    x = 470,788,099,600/318,160
  6. Step 6: Final answer
    x = 1,479,721.21

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.