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Finding the Fourth Proportional to 3,990.87, 5,980.76 and 2,038.95

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Solution

The fourth proportional to 3,990.87, 5,980.76 and 2,038.95 is: 3,055.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.87 : 5,980.76 = 2,038.95 : x
  2. Step 2: Convert to fraction form
    3,990.87/5,980.76 = 2,038.95/x
  3. Step 3: Cross multiply
    3,990.87x = 5,980.76 × 2,038.95
  4. Step 4: Simplify right side
    3,990.87x = 12,194,460.41
  5. Step 5: Solve for x
    x = 12,194,460.41/3,990.87
  6. Step 6: Final answer
    x = 3,055.59

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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.