Home / 2,221.36-3,064.80-1,289.68

Finding the Fourth Proportional to 2,221.36, 3,064.80 and 1,289.68

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Solution

The fourth proportional to 2,221.36, 3,064.80 and 1,289.68 is: 1,779.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,221.36 : 3,064.80 = 1,289.68 : x
  2. Step 2: Convert to fraction form
    2,221.36/3,064.80 = 1,289.68/x
  3. Step 3: Cross multiply
    2,221.36x = 3,064.80 × 1,289.68
  4. Step 4: Simplify right side
    2,221.36x = 3,952,611.26
  5. Step 5: Solve for x
    x = 3,952,611.26/2,221.36
  6. Step 6: Final answer
    x = 1,779.37

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1.5x scale

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.