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Finding the Fourth Proportional to 3,990.98, 5,987.42 and 1,358.62

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Solution

The fourth proportional to 3,990.98, 5,987.42 and 1,358.62 is: 2,038.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.98 : 5,987.42 = 1,358.62 : x
  2. Step 2: Convert to fraction form
    3,990.98/5,987.42 = 1,358.62/x
  3. Step 3: Cross multiply
    3,990.98x = 5,987.42 × 1,358.62
  4. Step 4: Simplify right side
    3,990.98x = 8,134,628.56
  5. Step 5: Solve for x
    x = 8,134,628.56/3,990.98
  6. Step 6: Final answer
    x = 2,038.25

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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.