Home / 3,921.90-5,881.61-1,288.80

Finding the Fourth Proportional to 3,921.90, 5,881.61 and 1,288.80

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Solution

The fourth proportional to 3,921.90, 5,881.61 and 1,288.80 is: 1,932.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,921.90 : 5,881.61 = 1,288.80 : x
  2. Step 2: Convert to fraction form
    3,921.90/5,881.61 = 1,288.80/x
  3. Step 3: Cross multiply
    3,921.90x = 5,881.61 × 1,288.80
  4. Step 4: Simplify right side
    3,921.90x = 7,580,214.94
  5. Step 5: Solve for x
    x = 7,580,214.94/3,921.90
  6. Step 6: Final answer
    x = 1,932.79

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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.