Home / 3,620.40-5,430.60-3,418.80

Finding the Fourth Proportional to 3,620.40, 5,430.60 and 3,418.80

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Solution

The fourth proportional to 3,620.40, 5,430.60 and 3,418.80 is: 5,128.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,620.40 : 5,430.60 = 3,418.80 : x
  2. Step 2: Convert to fraction form
    3,620.40/5,430.60 = 3,418.80/x
  3. Step 3: Cross multiply
    3,620.40x = 5,430.60 × 3,418.80
  4. Step 4: Simplify right side
    3,620.40x = 18,566,135.28
  5. Step 5: Solve for x
    x = 18,566,135.28/3,620.40
  6. Step 6: Final answer
    x = 5,128.20

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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.