Home / 3,840.12-5,758.20-1,990.80

Finding the Fourth Proportional to 3,840.12, 5,758.20 and 1,990.80

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Solution

The fourth proportional to 3,840.12, 5,758.20 and 1,990.80 is: 2,985.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,840.12 : 5,758.20 = 1,990.80 : x
  2. Step 2: Convert to fraction form
    3,840.12/5,758.20 = 1,990.80/x
  3. Step 3: Cross multiply
    3,840.12x = 5,758.20 × 1,990.80
  4. Step 4: Simplify right side
    3,840.12x = 11,463,424.56
  5. Step 5: Solve for x
    x = 11,463,424.56/3,840.12
  6. Step 6: Final answer
    x = 2,985.17

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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.