Home / 3,928.30-5,421.14-2,160.02

Finding the Fourth Proportional to 3,928.30, 5,421.14 and 2,160.02

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Solution

The fourth proportional to 3,928.30, 5,421.14 and 2,160.02 is: 2,980.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,928.30 : 5,421.14 = 2,160.02 : x
  2. Step 2: Convert to fraction form
    3,928.30/5,421.14 = 2,160.02/x
  3. Step 3: Cross multiply
    3,928.30x = 5,421.14 × 2,160.02
  4. Step 4: Simplify right side
    3,928.30x = 11,709,770.82
  5. Step 5: Solve for x
    x = 11,709,770.82/3,928.30
  6. Step 6: Final answer
    x = 2,980.87

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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.