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Finding the Third Proportional to 388 and 860

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Solution

The third proportional to 388 and 860 is: 1,906.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    388 : 860 = 860 : x
  2. Step 2: Convert to fraction form
    388/860 = 860/x
  3. Step 3: Cross multiply
    388x = 860 × 860
  4. Step 4: Simplify right side
    388x = 739,600
  5. Step 5: Solve for x
    x = 739,600/388
  6. Step 6: Final answer
    x = 1,906.19

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Why These Related Problems?

These problems maintain the same ratio (2.22) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.