Home / 3,940.31-5,430.14-2,819.30

Finding the Fourth Proportional to 3,940.31, 5,430.14 and 2,819.30

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Solution

The fourth proportional to 3,940.31, 5,430.14 and 2,819.30 is: 3,885.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.31 : 5,430.14 = 2,819.30 : x
  2. Step 2: Convert to fraction form
    3,940.31/5,430.14 = 2,819.30/x
  3. Step 3: Cross multiply
    3,940.31x = 5,430.14 × 2,819.30
  4. Step 4: Simplify right side
    3,940.31x = 15,309,152.45
  5. Step 5: Solve for x
    x = 15,309,152.45/3,940.31
  6. Step 6: Final answer
    x = 3,885.27

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1.5x scale

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.