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Finding the Fourth Proportional to 2,873.34, 3,960.90 and 1,990.98

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Solution

The fourth proportional to 2,873.34, 3,960.90 and 1,990.98 is: 2,744.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,873.34 : 3,960.90 = 1,990.98 : x
  2. Step 2: Convert to fraction form
    2,873.34/3,960.90 = 1,990.98/x
  3. Step 3: Cross multiply
    2,873.34x = 3,960.90 × 1,990.98
  4. Step 4: Simplify right side
    2,873.34x = 7,886,072.68
  5. Step 5: Solve for x
    x = 7,886,072.68/2,873.34
  6. Step 6: Final answer
    x = 2,744.57

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.