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Finding the Fourth Proportional to 7,185.78, 10,777.44 and 1,990.44

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Solution

The fourth proportional to 7,185.78, 10,777.44 and 1,990.44 is: 2,985.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,185.78 : 10,777.44 = 1,990.44 : x
  2. Step 2: Convert to fraction form
    7,185.78/10,777.44 = 1,990.44/x
  3. Step 3: Cross multiply
    7,185.78x = 10,777.44 × 1,990.44
  4. Step 4: Simplify right side
    7,185.78x = 21,451,847.67
  5. Step 5: Solve for x
    x = 21,451,847.67/7,185.78
  6. Step 6: Final answer
    x = 2,985.32

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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.