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Finding the Third Proportional to 5,405 and 8,216.50

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Solution

The third proportional to 5,405 and 8,216.50 is: 12,490.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,405 : 8,216.50 = 8,216.50 : x
  2. Step 2: Convert to fraction form
    5,405/8,216.50 = 8,216.50/x
  3. Step 3: Cross multiply
    5,405x = 8,216.50 × 8,216.50
  4. Step 4: Simplify right side
    5,405x = 67,510,872.25
  5. Step 5: Solve for x
    x = 67,510,872.25/5,405
  6. Step 6: Final answer
    x = 12,490.45

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.