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Finding the Third Proportional to 388.69 and 438.19

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Solution

The third proportional to 388.69 and 438.19 is: 493.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.69 : 438.19 = 438.19 : x
  2. Step 2: Convert to fraction form
    388.69/438.19 = 438.19/x
  3. Step 3: Cross multiply
    388.69x = 438.19 × 438.19
  4. Step 4: Simplify right side
    388.69x = 192,008.29
  5. Step 5: Solve for x
    x = 192,008.29/388.69
  6. Step 6: Final answer
    x = 493.99

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Why These Related Problems?

These problems maintain the same ratio (1.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.