Home / 1,188.20-1,782.60-408.22

Finding the Fourth Proportional to 1,188.20, 1,782.60 and 408.22

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Solution

The fourth proportional to 1,188.20, 1,782.60 and 408.22 is: 612.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,188.20 : 1,782.60 = 408.22 : x
  2. Step 2: Convert to fraction form
    1,188.20/1,782.60 = 408.22/x
  3. Step 3: Cross multiply
    1,188.20x = 1,782.60 × 408.22
  4. Step 4: Simplify right side
    1,188.20x = 727,682.34
  5. Step 5: Solve for x
    x = 727,682.34/1,188.20
  6. Step 6: Final answer
    x = 612.42

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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.