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Finding the Fourth Proportional to 1,990.39, 2,980.72 and 1,372.36

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Solution

The fourth proportional to 1,990.39, 2,980.72 and 1,372.36 is: 2,055.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.39 : 2,980.72 = 1,372.36 : x
  2. Step 2: Convert to fraction form
    1,990.39/2,980.72 = 1,372.36/x
  3. Step 3: Cross multiply
    1,990.39x = 2,980.72 × 1,372.36
  4. Step 4: Simplify right side
    1,990.39x = 4,090,620.90
  5. Step 5: Solve for x
    x = 4,090,620.90/1,990.39
  6. Step 6: Final answer
    x = 2,055.19

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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.