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Finding the Third Proportional to 318,708 and 689,688

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Solution

The third proportional to 318,708 and 689,688 is: 1,492,493.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,708 : 689,688 = 689,688 : x
  2. Step 2: Convert to fraction form
    318,708/689,688 = 689,688/x
  3. Step 3: Cross multiply
    318,708x = 689,688 × 689,688
  4. Step 4: Simplify right side
    318,708x = 475,669,537,344
  5. Step 5: Solve for x
    x = 475,669,537,344/318,708
  6. Step 6: Final answer
    x = 1,492,493.25

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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.