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Finding the Fourth Proportional to 1,991.04, 2,739.60 and 1,940.16

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Solution

The fourth proportional to 1,991.04, 2,739.60 and 1,940.16 is: 2,669.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.04 : 2,739.60 = 1,940.16 : x
  2. Step 2: Convert to fraction form
    1,991.04/2,739.60 = 1,940.16/x
  3. Step 3: Cross multiply
    1,991.04x = 2,739.60 × 1,940.16
  4. Step 4: Simplify right side
    1,991.04x = 5,315,262.34
  5. Step 5: Solve for x
    x = 5,315,262.34/1,991.04
  6. Step 6: Final answer
    x = 2,669.59

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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.