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Finding the Third Proportional to 438.38 and 628.13

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Solution

The third proportional to 438.38 and 628.13 is: 900.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.38 : 628.13 = 628.13 : x
  2. Step 2: Convert to fraction form
    438.38/628.13 = 628.13/x
  3. Step 3: Cross multiply
    438.38x = 628.13 × 628.13
  4. Step 4: Simplify right side
    438.38x = 394,541.02
  5. Step 5: Solve for x
    x = 394,541.02/438.38
  6. Step 6: Final answer
    x = 900.01

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.