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Finding the Fourth Proportional to 7,185.54, 10,777.08 and 1,990.20

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Solution

The fourth proportional to 7,185.54, 10,777.08 and 1,990.20 is: 2,984.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,185.54 : 10,777.08 = 1,990.20 : x
  2. Step 2: Convert to fraction form
    7,185.54/10,777.08 = 1,990.20/x
  3. Step 3: Cross multiply
    7,185.54x = 10,777.08 × 1,990.20
  4. Step 4: Simplify right side
    7,185.54x = 21,448,544.62
  5. Step 5: Solve for x
    x = 21,448,544.62/7,185.54
  6. Step 6: Final answer
    x = 2,984.96

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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.