Home / 3,128.82-4,690.48-1,280.20

Finding the Fourth Proportional to 3,128.82, 4,690.48 and 1,280.20

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Solution

The fourth proportional to 3,128.82, 4,690.48 and 1,280.20 is: 1,919.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,128.82 : 4,690.48 = 1,280.20 : x
  2. Step 2: Convert to fraction form
    3,128.82/4,690.48 = 1,280.20/x
  3. Step 3: Cross multiply
    3,128.82x = 4,690.48 × 1,280.20
  4. Step 4: Simplify right side
    3,128.82x = 6,004,752.50
  5. Step 5: Solve for x
    x = 6,004,752.50/3,128.82
  6. Step 6: Final answer
    x = 1,919.17

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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.