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Finding the Third Proportional to 432,378 and 690,717

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Solution

The third proportional to 432,378 and 690,717 is: 1,103,409.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    432,378 : 690,717 = 690,717 : x
  2. Step 2: Convert to fraction form
    432,378/690,717 = 690,717/x
  3. Step 3: Cross multiply
    432,378x = 690,717 × 690,717
  4. Step 4: Simplify right side
    432,378x = 477,089,974,089
  5. Step 5: Solve for x
    x = 477,089,974,089/432,378
  6. Step 6: Final answer
    x = 1,103,409.46

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.