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Finding the Fourth Proportional to 7,188.50, 10,782.75 and 1,994.38

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Solution

The fourth proportional to 7,188.50, 10,782.75 and 1,994.38 is: 2,991.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,188.50 : 10,782.75 = 1,994.38 : x
  2. Step 2: Convert to fraction form
    7,188.50/10,782.75 = 1,994.38/x
  3. Step 3: Cross multiply
    7,188.50x = 10,782.75 × 1,994.38
  4. Step 4: Simplify right side
    7,188.50x = 21,504,847.03
  5. Step 5: Solve for x
    x = 21,504,847.03/7,188.50
  6. Step 6: Final answer
    x = 2,991.56

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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.