Home / 2,120.75-3,181.35-581.75

Finding the Fourth Proportional to 2,120.75, 3,181.35 and 581.75

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Solution

The fourth proportional to 2,120.75, 3,181.35 and 581.75 is: 872.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.75 : 3,181.35 = 581.75 : x
  2. Step 2: Convert to fraction form
    2,120.75/3,181.35 = 581.75/x
  3. Step 3: Cross multiply
    2,120.75x = 3,181.35 × 581.75
  4. Step 4: Simplify right side
    2,120.75x = 1,850,750.36
  5. Step 5: Solve for x
    x = 1,850,750.36/2,120.75
  6. Step 6: Final answer
    x = 872.69

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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.