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Finding the Third Proportional to 317,292 and 689,880

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Solution

The third proportional to 317,292 and 689,880 is: 1,499,988.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    317,292 : 689,880 = 689,880 : x
  2. Step 2: Convert to fraction form
    317,292/689,880 = 689,880/x
  3. Step 3: Cross multiply
    317,292x = 689,880 × 689,880
  4. Step 4: Simplify right side
    317,292x = 475,934,414,400
  5. Step 5: Solve for x
    x = 475,934,414,400/317,292
  6. Step 6: Final answer
    x = 1,499,988.70

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Why These Related Problems?

These problems maintain the same ratio (2.17) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.