Home / 5,418.57-8,128.74-1,720.80

Finding the Fourth Proportional to 5,418.57, 8,128.74 and 1,720.80

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Solution

The fourth proportional to 5,418.57, 8,128.74 and 1,720.80 is: 2,581.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,418.57 : 8,128.74 = 1,720.80 : x
  2. Step 2: Convert to fraction form
    5,418.57/8,128.74 = 1,720.80/x
  3. Step 3: Cross multiply
    5,418.57x = 8,128.74 × 1,720.80
  4. Step 4: Simplify right side
    5,418.57x = 13,987,935.79
  5. Step 5: Solve for x
    x = 13,987,935.79/5,418.57
  6. Step 6: Final answer
    x = 2,581.48

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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.