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Finding the Third Proportional to 8,405.50 and 11,421.75

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Solution

The third proportional to 8,405.50 and 11,421.75 is: 15,520.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,405.50 : 11,421.75 = 11,421.75 : x
  2. Step 2: Convert to fraction form
    8,405.50/11,421.75 = 11,421.75/x
  3. Step 3: Cross multiply
    8,405.50x = 11,421.75 × 11,421.75
  4. Step 4: Simplify right side
    8,405.50x = 130,456,373.06
  5. Step 5: Solve for x
    x = 130,456,373.06/8,405.50
  6. Step 6: Final answer
    x = 15,520.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.