Home / 2,220.25-3,063.99-1,288.75

Finding the Fourth Proportional to 2,220.25, 3,063.99 and 1,288.75

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Solution

The fourth proportional to 2,220.25, 3,063.99 and 1,288.75 is: 1,778.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,220.25 : 3,063.99 = 1,288.75 : x
  2. Step 2: Convert to fraction form
    2,220.25/3,063.99 = 1,288.75/x
  3. Step 3: Cross multiply
    2,220.25x = 3,063.99 × 1,288.75
  4. Step 4: Simplify right side
    2,220.25x = 3,948,717.11
  5. Step 5: Solve for x
    x = 3,948,717.11/2,220.25
  6. Step 6: Final answer
    x = 1,778.50

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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.