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Finding the Third Proportional to 528.38 and 643.13

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Solution

The third proportional to 528.38 and 643.13 is: 782.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.38 : 643.13 = 643.13 : x
  2. Step 2: Convert to fraction form
    528.38/643.13 = 643.13/x
  3. Step 3: Cross multiply
    528.38x = 643.13 × 643.13
  4. Step 4: Simplify right side
    528.38x = 413,609.77
  5. Step 5: Solve for x
    x = 413,609.77/528.38
  6. Step 6: Final answer
    x = 782.80

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Why These Related Problems?

These problems maintain the same ratio (1.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.