Home / 3,913.96-5,399.20-2,421.40

Finding the Fourth Proportional to 3,913.96, 5,399.20 and 2,421.40

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Solution

The fourth proportional to 3,913.96, 5,399.20 and 2,421.40 is: 3,340.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,913.96 : 5,399.20 = 2,421.40 : x
  2. Step 2: Convert to fraction form
    3,913.96/5,399.20 = 2,421.40/x
  3. Step 3: Cross multiply
    3,913.96x = 5,399.20 × 2,421.40
  4. Step 4: Simplify right side
    3,913.96x = 13,073,622.88
  5. Step 5: Solve for x
    x = 13,073,622.88/3,913.96
  6. Step 6: Final answer
    x = 3,340.25

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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.