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Finding the Fourth Proportional to 4,761.81, 7,137.81 and 1,990.10

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Solution

The fourth proportional to 4,761.81, 7,137.81 and 1,990.10 is: 2,983.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,761.81 : 7,137.81 = 1,990.10 : x
  2. Step 2: Convert to fraction form
    4,761.81/7,137.81 = 1,990.10/x
  3. Step 3: Cross multiply
    4,761.81x = 7,137.81 × 1,990.10
  4. Step 4: Simplify right side
    4,761.81x = 14,204,955.68
  5. Step 5: Solve for x
    x = 14,204,955.68/4,761.81
  6. Step 6: Final answer
    x = 2,983.10

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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.