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Finding the Third Proportional to 438 and 613.13

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Solution

The third proportional to 438 and 613.13 is: 858.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    438 : 613.13 = 613.13 : x
  2. Step 2: Convert to fraction form
    438/613.13 = 613.13/x
  3. Step 3: Cross multiply
    438x = 613.13 × 613.13
  4. Step 4: Simplify right side
    438x = 375,922.27
  5. Step 5: Solve for x
    x = 375,922.27/438
  6. Step 6: Final answer
    x = 858.27

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.