Home / 3,620.60-5,430.90-2,142.20

Finding the Fourth Proportional to 3,620.60, 5,430.90 and 2,142.20

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Solution

The fourth proportional to 3,620.60, 5,430.90 and 2,142.20 is: 3,213.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,620.60 : 5,430.90 = 2,142.20 : x
  2. Step 2: Convert to fraction form
    3,620.60/5,430.90 = 2,142.20/x
  3. Step 3: Cross multiply
    3,620.60x = 5,430.90 × 2,142.20
  4. Step 4: Simplify right side
    3,620.60x = 11,634,073.98
  5. Step 5: Solve for x
    x = 11,634,073.98/3,620.60
  6. Step 6: Final answer
    x = 3,213.30

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.