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Finding the Third Proportional to 361.41 and 780.47

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Solution

The third proportional to 361.41 and 780.47 is: 1,685.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.41 : 780.47 = 780.47 : x
  2. Step 2: Convert to fraction form
    361.41/780.47 = 780.47/x
  3. Step 3: Cross multiply
    361.41x = 780.47 × 780.47
  4. Step 4: Simplify right side
    361.41x = 609,131.47
  5. Step 5: Solve for x
    x = 609,131.47/361.41
  6. Step 6: Final answer
    x = 1,685.45

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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.