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Finding the Third Proportional to 438 and 613.88

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Solution

The third proportional to 438 and 613.88 is: 860.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    438 : 613.88 = 613.88 : x
  2. Step 2: Convert to fraction form
    438/613.88 = 613.88/x
  3. Step 3: Cross multiply
    438x = 613.88 × 613.88
  4. Step 4: Simplify right side
    438x = 376,842.52
  5. Step 5: Solve for x
    x = 376,842.52/438
  6. Step 6: Final answer
    x = 860.37

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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.