Home / 3,571.36-4,928.40-1,978

Finding the Fourth Proportional to 3,571.36, 4,928.40 and 1,978

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Solution

The fourth proportional to 3,571.36, 4,928.40 and 1,978 is: 2,729.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,571.36 : 4,928.40 = 1,978 : x
  2. Step 2: Convert to fraction form
    3,571.36/4,928.40 = 1,978/x
  3. Step 3: Cross multiply
    3,571.36x = 4,928.40 × 1,978
  4. Step 4: Simplify right side
    3,571.36x = 9,748,375.20
  5. Step 5: Solve for x
    x = 9,748,375.20/3,571.36
  6. Step 6: Final answer
    x = 2,729.60

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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.