Home / 2,813.90-4,223.40-1,428.20

Finding the Fourth Proportional to 2,813.90, 4,223.40 and 1,428.20

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Solution

The fourth proportional to 2,813.90, 4,223.40 and 1,428.20 is: 2,143.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,813.90 : 4,223.40 = 1,428.20 : x
  2. Step 2: Convert to fraction form
    2,813.90/4,223.40 = 1,428.20/x
  3. Step 3: Cross multiply
    2,813.90x = 4,223.40 × 1,428.20
  4. Step 4: Simplify right side
    2,813.90x = 6,031,859.88
  5. Step 5: Solve for x
    x = 6,031,859.88/2,813.90
  6. Step 6: Final answer
    x = 2,143.59

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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.