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Finding the Third Proportional to 428.25 and 661.13

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Solution

The third proportional to 428.25 and 661.13 is: 1,020.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.25 : 661.13 = 661.13 : x
  2. Step 2: Convert to fraction form
    428.25/661.13 = 661.13/x
  3. Step 3: Cross multiply
    428.25x = 661.13 × 661.13
  4. Step 4: Simplify right side
    428.25x = 437,086.27
  5. Step 5: Solve for x
    x = 437,086.27/428.25
  6. Step 6: Final answer
    x = 1,020.63

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.