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Finding the Fourth Proportional to 1,991.77, 2,749.88 and 1,283.96

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Solution

The fourth proportional to 1,991.77, 2,749.88 and 1,283.96 is: 1,772.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.77 : 2,749.88 = 1,283.96 : x
  2. Step 2: Convert to fraction form
    1,991.77/2,749.88 = 1,283.96/x
  3. Step 3: Cross multiply
    1,991.77x = 2,749.88 × 1,283.96
  4. Step 4: Simplify right side
    1,991.77x = 3,530,746.01
  5. Step 5: Solve for x
    x = 3,530,746.01/1,991.77
  6. Step 6: Final answer
    x = 1,772.67

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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.