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Finding the Third Proportional to 320,065 and 689,702

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Solution

The third proportional to 320,065 and 689,702 is: 1,486,225.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,065 : 689,702 = 689,702 : x
  2. Step 2: Convert to fraction form
    320,065/689,702 = 689,702/x
  3. Step 3: Cross multiply
    320,065x = 689,702 × 689,702
  4. Step 4: Simplify right side
    320,065x = 475,688,848,804
  5. Step 5: Solve for x
    x = 475,688,848,804/320,065
  6. Step 6: Final answer
    x = 1,486,225.76

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.