Home / 2,220.72-3,064.80-1,289.28

Finding the Fourth Proportional to 2,220.72, 3,064.80 and 1,289.28

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Solution

The fourth proportional to 2,220.72, 3,064.80 and 1,289.28 is: 1,779.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,220.72 : 3,064.80 = 1,289.28 : x
  2. Step 2: Convert to fraction form
    2,220.72/3,064.80 = 1,289.28/x
  3. Step 3: Cross multiply
    2,220.72x = 3,064.80 × 1,289.28
  4. Step 4: Simplify right side
    2,220.72x = 3,951,385.34
  5. Step 5: Solve for x
    x = 3,951,385.34/2,220.72
  6. Step 6: Final answer
    x = 1,779.33

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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.