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Finding the Fourth Proportional to 6,786.20, 9,363.54 and 3,990.20

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Solution

The fourth proportional to 6,786.20, 9,363.54 and 3,990.20 is: 5,505.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,786.20 : 9,363.54 = 3,990.20 : x
  2. Step 2: Convert to fraction form
    6,786.20/9,363.54 = 3,990.20/x
  3. Step 3: Cross multiply
    6,786.20x = 9,363.54 × 3,990.20
  4. Step 4: Simplify right side
    6,786.20x = 37,362,397.31
  5. Step 5: Solve for x
    x = 37,362,397.31/6,786.20
  6. Step 6: Final answer
    x = 5,505.64

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Half scale
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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.