Home / 3,970.21-5,480.65-2,779.88

Finding the Fourth Proportional to 3,970.21, 5,480.65 and 2,779.88

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Solution

The fourth proportional to 3,970.21, 5,480.65 and 2,779.88 is: 3,837.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,970.21 : 5,480.65 = 2,779.88 : x
  2. Step 2: Convert to fraction form
    3,970.21/5,480.65 = 2,779.88/x
  3. Step 3: Cross multiply
    3,970.21x = 5,480.65 × 2,779.88
  4. Step 4: Simplify right side
    3,970.21x = 15,235,514.97
  5. Step 5: Solve for x
    x = 15,235,514.97/3,970.21
  6. Step 6: Final answer
    x = 3,837.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.