Home / 1,485.45-2,228.30-389.81

Finding the Fourth Proportional to 1,485.45, 2,228.30 and 389.81

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Solution

The fourth proportional to 1,485.45, 2,228.30 and 389.81 is: 584.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.45 : 2,228.30 = 389.81 : x
  2. Step 2: Convert to fraction form
    1,485.45/2,228.30 = 389.81/x
  3. Step 3: Cross multiply
    1,485.45x = 2,228.30 × 389.81
  4. Step 4: Simplify right side
    1,485.45x = 868,618.16
  5. Step 5: Solve for x
    x = 868,618.16/1,485.45
  6. Step 6: Final answer
    x = 584.75

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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.