Home / 3,928.28-5,421.11-2,159.98

Finding the Fourth Proportional to 3,928.28, 5,421.11 and 2,159.98

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Solution

The fourth proportional to 3,928.28, 5,421.11 and 2,159.98 is: 2,980.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.28 : 5,421.11 = 2,159.98 : x
  2. Step 2: Convert to fraction form
    3,928.28/5,421.11 = 2,159.98/x
  3. Step 3: Cross multiply
    3,928.28x = 5,421.11 × 2,159.98
  4. Step 4: Simplify right side
    3,928.28x = 11,709,494.58
  5. Step 5: Solve for x
    x = 11,709,494.58/3,928.28
  6. Step 6: Final answer
    x = 2,980.82

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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.