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Finding the Third Proportional to 421 and 782.75

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Solution

The third proportional to 421 and 782.75 is: 1,455.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    421 : 782.75 = 782.75 : x
  2. Step 2: Convert to fraction form
    421/782.75 = 782.75/x
  3. Step 3: Cross multiply
    421x = 782.75 × 782.75
  4. Step 4: Simplify right side
    421x = 612,697.56
  5. Step 5: Solve for x
    x = 612,697.56/421
  6. Step 6: Final answer
    x = 1,455.34

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Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.