Home / 2,815.40-4,223.10-1,355.78

Finding the Fourth Proportional to 2,815.40, 4,223.10 and 1,355.78

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Solution

The fourth proportional to 2,815.40, 4,223.10 and 1,355.78 is: 2,033.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,815.40 : 4,223.10 = 1,355.78 : x
  2. Step 2: Convert to fraction form
    2,815.40/4,223.10 = 1,355.78/x
  3. Step 3: Cross multiply
    2,815.40x = 4,223.10 × 1,355.78
  4. Step 4: Simplify right side
    2,815.40x = 5,725,594.52
  5. Step 5: Solve for x
    x = 5,725,594.52/2,815.40
  6. Step 6: Final answer
    x = 2,033.67

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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.