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Finding the Fourth Proportional to 3,990.76, 5,986.41 and 1,357.19

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Solution

The fourth proportional to 3,990.76, 5,986.41 and 1,357.19 is: 2,035.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.76 : 5,986.41 = 1,357.19 : x
  2. Step 2: Convert to fraction form
    3,990.76/5,986.41 = 1,357.19/x
  3. Step 3: Cross multiply
    3,990.76x = 5,986.41 × 1,357.19
  4. Step 4: Simplify right side
    3,990.76x = 8,124,695.79
  5. Step 5: Solve for x
    x = 8,124,695.79/3,990.76
  6. Step 6: Final answer
    x = 2,035.88

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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.