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Finding the Fourth Proportional to 3,990.62, 5,980.38 and 2,038.70

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Solution

The fourth proportional to 3,990.62, 5,980.38 and 2,038.70 is: 3,055.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.62 : 5,980.38 = 2,038.70 : x
  2. Step 2: Convert to fraction form
    3,990.62/5,980.38 = 2,038.70/x
  3. Step 3: Cross multiply
    3,990.62x = 5,980.38 × 2,038.70
  4. Step 4: Simplify right side
    3,990.62x = 12,192,200.71
  5. Step 5: Solve for x
    x = 12,192,200.71/3,990.62
  6. Step 6: Final answer
    x = 3,055.21

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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.