Home / 1,485.20-2,227.80-389.56

Finding the Fourth Proportional to 1,485.20, 2,227.80 and 389.56

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Solution

The fourth proportional to 1,485.20, 2,227.80 and 389.56 is: 584.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,485.20 : 2,227.80 = 389.56 : x
  2. Step 2: Convert to fraction form
    1,485.20/2,227.80 = 389.56/x
  3. Step 3: Cross multiply
    1,485.20x = 2,227.80 × 389.56
  4. Step 4: Simplify right side
    1,485.20x = 867,861.77
  5. Step 5: Solve for x
    x = 867,861.77/1,485.20
  6. Step 6: Final answer
    x = 584.34

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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.