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Finding the Third Proportional to 313,470 and 689,140

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Solution

The third proportional to 313,470 and 689,140 is: 1,515,021.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,470 : 689,140 = 689,140 : x
  2. Step 2: Convert to fraction form
    313,470/689,140 = 689,140/x
  3. Step 3: Cross multiply
    313,470x = 689,140 × 689,140
  4. Step 4: Simplify right side
    313,470x = 474,913,939,600
  5. Step 5: Solve for x
    x = 474,913,939,600/313,470
  6. Step 6: Final answer
    x = 1,515,021.98

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.