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Finding the Third Proportional to 7,725 and 12,739.50

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Solution

The third proportional to 7,725 and 12,739.50 is: 21,009.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,725 : 12,739.50 = 12,739.50 : x
  2. Step 2: Convert to fraction form
    7,725/12,739.50 = 12,739.50/x
  3. Step 3: Cross multiply
    7,725x = 12,739.50 × 12,739.50
  4. Step 4: Simplify right side
    7,725x = 162,294,860.25
  5. Step 5: Solve for x
    x = 162,294,860.25/7,725
  6. Step 6: Final answer
    x = 21,009.04

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.