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Finding the Third Proportional to 426.19 and 643.03

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Solution

The third proportional to 426.19 and 643.03 is: 970.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.19 : 643.03 = 643.03 : x
  2. Step 2: Convert to fraction form
    426.19/643.03 = 643.03/x
  3. Step 3: Cross multiply
    426.19x = 643.03 × 643.03
  4. Step 4: Simplify right side
    426.19x = 413,489.19
  5. Step 5: Solve for x
    x = 413,489.19/426.19
  6. Step 6: Final answer
    x = 970.20

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.