Home / 1,991-2,749.20-1,726.40

Finding the Fourth Proportional to 1,991, 2,749.20 and 1,726.40

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Solution

The fourth proportional to 1,991, 2,749.20 and 1,726.40 is: 2,383.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991 : 2,749.20 = 1,726.40 : x
  2. Step 2: Convert to fraction form
    1,991/2,749.20 = 1,726.40/x
  3. Step 3: Cross multiply
    1,991x = 2,749.20 × 1,726.40
  4. Step 4: Simplify right side
    1,991x = 4,746,218.88
  5. Step 5: Solve for x
    x = 4,746,218.88/1,991
  6. Step 6: Final answer
    x = 2,383.84

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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.