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Finding the Fourth Proportional to 3,616.50, 4,990.78 and 1,960.50

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Solution

The fourth proportional to 3,616.50, 4,990.78 and 1,960.50 is: 2,705.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,616.50 : 4,990.78 = 1,960.50 : x
  2. Step 2: Convert to fraction form
    3,616.50/4,990.78 = 1,960.50/x
  3. Step 3: Cross multiply
    3,616.50x = 4,990.78 × 1,960.50
  4. Step 4: Simplify right side
    3,616.50x = 9,784,424.19
  5. Step 5: Solve for x
    x = 9,784,424.19/3,616.50
  6. Step 6: Final answer
    x = 2,705.50

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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.