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Finding the Third Proportional to 428.13 and 581.25

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Solution

The third proportional to 428.13 and 581.25 is: 789.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.13 : 581.25 = 581.25 : x
  2. Step 2: Convert to fraction form
    428.13/581.25 = 581.25/x
  3. Step 3: Cross multiply
    428.13x = 581.25 × 581.25
  4. Step 4: Simplify right side
    428.13x = 337,851.56
  5. Step 5: Solve for x
    x = 337,851.56/428.13
  6. Step 6: Final answer
    x = 789.14

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.