Home / 2,221.24-3,065.70-1,289.80

Finding the Fourth Proportional to 2,221.24, 3,065.70 and 1,289.80

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Solution

The fourth proportional to 2,221.24, 3,065.70 and 1,289.80 is: 1,780.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,221.24 : 3,065.70 = 1,289.80 : x
  2. Step 2: Convert to fraction form
    2,221.24/3,065.70 = 1,289.80/x
  3. Step 3: Cross multiply
    2,221.24x = 3,065.70 × 1,289.80
  4. Step 4: Simplify right side
    2,221.24x = 3,954,139.86
  5. Step 5: Solve for x
    x = 3,954,139.86/2,221.24
  6. Step 6: Final answer
    x = 1,780.15

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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.