Home / 2,079.20-3,118.80-1,257.05

Finding the Fourth Proportional to 2,079.20, 3,118.80 and 1,257.05

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Solution

The fourth proportional to 2,079.20, 3,118.80 and 1,257.05 is: 1,885.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,079.20 : 3,118.80 = 1,257.05 : x
  2. Step 2: Convert to fraction form
    2,079.20/3,118.80 = 1,257.05/x
  3. Step 3: Cross multiply
    2,079.20x = 3,118.80 × 1,257.05
  4. Step 4: Simplify right side
    2,079.20x = 3,920,487.54
  5. Step 5: Solve for x
    x = 3,920,487.54/2,079.20
  6. Step 6: Final answer
    x = 1,885.58

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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.