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Finding the Fourth Proportional to 7,891,906.80, 11,837,860.20 and 3,640,378.80

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Solution

The fourth proportional to 7,891,906.80, 11,837,860.20 and 3,640,378.80 is: 5,460,568.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,891,906.80 : 11,837,860.20 = 3,640,378.80 : x
  2. Step 2: Convert to fraction form
    7,891,906.80/11,837,860.20 = 3,640,378.80/x
  3. Step 3: Cross multiply
    7,891,906.80x = 11,837,860.20 × 3,640,378.80
  4. Step 4: Simplify right side
    7,891,906.80x = 43,094,295,309,443.76
  5. Step 5: Solve for x
    x = 43,094,295,309,443.76/7,891,906.80
  6. Step 6: Final answer
    x = 5,460,568.20

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.