Home / 6,639.75-9,161.66-3,987.20

Finding the Fourth Proportional to 6,639.75, 9,161.66 and 3,987.20

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Solution

The fourth proportional to 6,639.75, 9,161.66 and 3,987.20 is: 5,501.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,639.75 : 9,161.66 = 3,987.20 : x
  2. Step 2: Convert to fraction form
    6,639.75/9,161.66 = 3,987.20/x
  3. Step 3: Cross multiply
    6,639.75x = 9,161.66 × 3,987.20
  4. Step 4: Simplify right side
    6,639.75x = 36,529,355.43
  5. Step 5: Solve for x
    x = 36,529,355.43/6,639.75
  6. Step 6: Final answer
    x = 5,501.62

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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 (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.