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Finding the Fourth Proportional to 3,993.60, 5,990.40 and 1,220.28

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Solution

The fourth proportional to 3,993.60, 5,990.40 and 1,220.28 is: 1,830.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,993.60 : 5,990.40 = 1,220.28 : x
  2. Step 2: Convert to fraction form
    3,993.60/5,990.40 = 1,220.28/x
  3. Step 3: Cross multiply
    3,993.60x = 5,990.40 × 1,220.28
  4. Step 4: Simplify right side
    3,993.60x = 7,309,965.31
  5. Step 5: Solve for x
    x = 7,309,965.31/3,993.60
  6. Step 6: Final answer
    x = 1,830.42

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