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Finding the Third Proportional to 489,470 and 689,292

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Solution

The third proportional to 489,470 and 689,292 is: 970,689.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,470 : 689,292 = 689,292 : x
  2. Step 2: Convert to fraction form
    489,470/689,292 = 689,292/x
  3. Step 3: Cross multiply
    489,470x = 689,292 × 689,292
  4. Step 4: Simplify right side
    489,470x = 475,123,461,264
  5. Step 5: Solve for x
    x = 475,123,461,264/489,470
  6. Step 6: Final answer
    x = 970,689.65

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.