Home / 3,986.02-5,981.43-1,390.78

Finding the Fourth Proportional to 3,986.02, 5,981.43 and 1,390.78

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Solution

The fourth proportional to 3,986.02, 5,981.43 and 1,390.78 is: 2,087.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986.02 : 5,981.43 = 1,390.78 : x
  2. Step 2: Convert to fraction form
    3,986.02/5,981.43 = 1,390.78/x
  3. Step 3: Cross multiply
    3,986.02x = 5,981.43 × 1,390.78
  4. Step 4: Simplify right side
    3,986.02x = 8,318,853.22
  5. Step 5: Solve for x
    x = 8,318,853.22/3,986.02
  6. Step 6: Final answer
    x = 2,087.01

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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.