Home / 2,638.80-3,953.40-2,149.20

Finding the Fourth Proportional to 2,638.80, 3,953.40 and 2,149.20

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Solution

The fourth proportional to 2,638.80, 3,953.40 and 2,149.20 is: 3,219.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.80 : 3,953.40 = 2,149.20 : x
  2. Step 2: Convert to fraction form
    2,638.80/3,953.40 = 2,149.20/x
  3. Step 3: Cross multiply
    2,638.80x = 3,953.40 × 2,149.20
  4. Step 4: Simplify right side
    2,638.80x = 8,496,647.28
  5. Step 5: Solve for x
    x = 8,496,647.28/2,638.80
  6. Step 6: Final answer
    x = 3,219.89

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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.