Home / 2,185.20-3,015.36-1,288.92

Finding the Fourth Proportional to 2,185.20, 3,015.36 and 1,288.92

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Solution

The fourth proportional to 2,185.20, 3,015.36 and 1,288.92 is: 1,778.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,185.20 : 3,015.36 = 1,288.92 : x
  2. Step 2: Convert to fraction form
    2,185.20/3,015.36 = 1,288.92/x
  3. Step 3: Cross multiply
    2,185.20x = 3,015.36 × 1,288.92
  4. Step 4: Simplify right side
    2,185.20x = 3,886,557.81
  5. Step 5: Solve for x
    x = 3,886,557.81/2,185.20
  6. Step 6: Final answer
    x = 1,778.58

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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.