Home / 2,811.80-4,215.30-1,987.48

Finding the Fourth Proportional to 2,811.80, 4,215.30 and 1,987.48

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Solution

The fourth proportional to 2,811.80, 4,215.30 and 1,987.48 is: 2,979.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,811.80 : 4,215.30 = 1,987.48 : x
  2. Step 2: Convert to fraction form
    2,811.80/4,215.30 = 1,987.48/x
  3. Step 3: Cross multiply
    2,811.80x = 4,215.30 × 1,987.48
  4. Step 4: Simplify right side
    2,811.80x = 8,377,824.44
  5. Step 5: Solve for x
    x = 8,377,824.44/2,811.80
  6. Step 6: Final answer
    x = 2,979.52

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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.