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Finding the Third Proportional to 3,486.66 and 4,990.78

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Solution

The third proportional to 3,486.66 and 4,990.78 is: 7,143.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,486.66 : 4,990.78 = 4,990.78 : x
  2. Step 2: Convert to fraction form
    3,486.66/4,990.78 = 4,990.78/x
  3. Step 3: Cross multiply
    3,486.66x = 4,990.78 × 4,990.78
  4. Step 4: Simplify right side
    3,486.66x = 24,907,897.49
  5. Step 5: Solve for x
    x = 24,907,897.49/3,486.66
  6. Step 6: Final answer
    x = 7,143.78

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.