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Finding the Third Proportional to 320,506 and 691,785

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Solution

The third proportional to 320,506 and 691,785 is: 1,493,159.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,506 : 691,785 = 691,785 : x
  2. Step 2: Convert to fraction form
    320,506/691,785 = 691,785/x
  3. Step 3: Cross multiply
    320,506x = 691,785 × 691,785
  4. Step 4: Simplify right side
    320,506x = 478,566,486,225
  5. Step 5: Solve for x
    x = 478,566,486,225/320,506
  6. Step 6: Final answer
    x = 1,493,159.21

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.