Home / 1,905.20-2,859.44-1,085.12

Finding the Fourth Proportional to 1,905.20, 2,859.44 and 1,085.12

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Solution

The fourth proportional to 1,905.20, 2,859.44 and 1,085.12 is: 1,628.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,905.20 : 2,859.44 = 1,085.12 : x
  2. Step 2: Convert to fraction form
    1,905.20/2,859.44 = 1,085.12/x
  3. Step 3: Cross multiply
    1,905.20x = 2,859.44 × 1,085.12
  4. Step 4: Simplify right side
    1,905.20x = 3,102,835.53
  5. Step 5: Solve for x
    x = 3,102,835.53/1,905.20
  6. Step 6: Final answer
    x = 1,628.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.