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Finding the Fourth Proportional to 1,990.87, 2,986.31 and 604.22

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Solution

The fourth proportional to 1,990.87, 2,986.31 and 604.22 is: 906.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.87 : 2,986.31 = 604.22 : x
  2. Step 2: Convert to fraction form
    1,990.87/2,986.31 = 604.22/x
  3. Step 3: Cross multiply
    1,990.87x = 2,986.31 × 604.22
  4. Step 4: Simplify right side
    1,990.87x = 1,804,374.81
  5. Step 5: Solve for x
    x = 1,804,374.81/1,990.87
  6. Step 6: Final answer
    x = 906.33

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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.