Home / 2,818.40-3,890.36-1,639.84

Finding the Fourth Proportional to 2,818.40, 3,890.36 and 1,639.84

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Solution

The fourth proportional to 2,818.40, 3,890.36 and 1,639.84 is: 2,263.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,818.40 : 3,890.36 = 1,639.84 : x
  2. Step 2: Convert to fraction form
    2,818.40/3,890.36 = 1,639.84/x
  3. Step 3: Cross multiply
    2,818.40x = 3,890.36 × 1,639.84
  4. Step 4: Simplify right side
    2,818.40x = 6,379,567.94
  5. Step 5: Solve for x
    x = 6,379,567.94/2,818.40
  6. Step 6: Final answer
    x = 2,263.54

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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.