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Finding the Fourth Proportional to 2,840.81, 3,920.20 and 1,581.80

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Solution

The fourth proportional to 2,840.81, 3,920.20 and 1,581.80 is: 2,182.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,840.81 : 3,920.20 = 1,581.80 : x
  2. Step 2: Convert to fraction form
    2,840.81/3,920.20 = 1,581.80/x
  3. Step 3: Cross multiply
    2,840.81x = 3,920.20 × 1,581.80
  4. Step 4: Simplify right side
    2,840.81x = 6,200,948.80
  5. Step 5: Solve for x
    x = 6,200,948.80/2,840.81
  6. Step 6: Final answer
    x = 2,182.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.