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Finding the Third Proportional to 428.75 and 922.75

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Solution

The third proportional to 428.75 and 922.75 is: 1,985.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.75 : 922.75 = 922.75 : x
  2. Step 2: Convert to fraction form
    428.75/922.75 = 922.75/x
  3. Step 3: Cross multiply
    428.75x = 922.75 × 922.75
  4. Step 4: Simplify right side
    428.75x = 851,467.56
  5. Step 5: Solve for x
    x = 851,467.56/428.75
  6. Step 6: Final answer
    x = 1,985.93

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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.