Home / 1,485.75-2,228.44-390.21

Finding the Fourth Proportional to 1,485.75, 2,228.44 and 390.21

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Solution

The fourth proportional to 1,485.75, 2,228.44 and 390.21 is: 585.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.75 : 2,228.44 = 390.21 : x
  2. Step 2: Convert to fraction form
    1,485.75/2,228.44 = 390.21/x
  3. Step 3: Cross multiply
    1,485.75x = 2,228.44 × 390.21
  4. Step 4: Simplify right side
    1,485.75x = 869,559.57
  5. Step 5: Solve for x
    x = 869,559.57/1,485.75
  6. Step 6: Final answer
    x = 585.27

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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.