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Finding the Third Proportional to 7,947 and 12,390.75

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Solution

The third proportional to 7,947 and 12,390.75 is: 19,319.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,947 : 12,390.75 = 12,390.75 : x
  2. Step 2: Convert to fraction form
    7,947/12,390.75 = 12,390.75/x
  3. Step 3: Cross multiply
    7,947x = 12,390.75 × 12,390.75
  4. Step 4: Simplify right side
    7,947x = 153,530,685.56
  5. Step 5: Solve for x
    x = 153,530,685.56/7,947
  6. Step 6: Final answer
    x = 19,319.33

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.