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Finding the Third Proportional to 489,386 and 689,174

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Solution

The third proportional to 489,386 and 689,174 is: 970,523.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    489,386 : 689,174 = 689,174 : x
  2. Step 2: Convert to fraction form
    489,386/689,174 = 689,174/x
  3. Step 3: Cross multiply
    489,386x = 689,174 × 689,174
  4. Step 4: Simplify right side
    489,386x = 474,960,802,276
  5. Step 5: Solve for x
    x = 474,960,802,276/489,386
  6. Step 6: Final answer
    x = 970,523.89

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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.