Home / 3,928.09-5,420.62-2,159.68

Finding the Fourth Proportional to 3,928.09, 5,420.62 and 2,159.68

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Solution

The fourth proportional to 3,928.09, 5,420.62 and 2,159.68 is: 2,980.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.09 : 5,420.62 = 2,159.68 : x
  2. Step 2: Convert to fraction form
    3,928.09/5,420.62 = 2,159.68/x
  3. Step 3: Cross multiply
    3,928.09x = 5,420.62 × 2,159.68
  4. Step 4: Simplify right side
    3,928.09x = 11,706,804.60
  5. Step 5: Solve for x
    x = 11,706,804.60/3,928.09
  6. Step 6: Final answer
    x = 2,980.28

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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.