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Finding the Third Proportional to 388.55 and 839.74

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Solution

The third proportional to 388.55 and 839.74 is: 1,814.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    388.55 : 839.74 = 839.74 : x
  2. Step 2: Convert to fraction form
    388.55/839.74 = 839.74/x
  3. Step 3: Cross multiply
    388.55x = 839.74 × 839.74
  4. Step 4: Simplify right side
    388.55x = 705,166.94
  5. Step 5: Solve for x
    x = 705,166.94/388.55
  6. Step 6: Final answer
    x = 1,814.88

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.