Home / 2,007.80-2,772.30-1,388.60

Finding the Fourth Proportional to 2,007.80, 2,772.30 and 1,388.60

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Solution

The fourth proportional to 2,007.80, 2,772.30 and 1,388.60 is: 1,917.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,007.80 : 2,772.30 = 1,388.60 : x
  2. Step 2: Convert to fraction form
    2,007.80/2,772.30 = 1,388.60/x
  3. Step 3: Cross multiply
    2,007.80x = 2,772.30 × 1,388.60
  4. Step 4: Simplify right side
    2,007.80x = 3,849,615.78
  5. Step 5: Solve for x
    x = 3,849,615.78/2,007.80
  6. Step 6: Final answer
    x = 1,917.33

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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.