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Finding the Fourth Proportional to 682.09, 940.80 and 420.22

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Solution

The fourth proportional to 682.09, 940.80 and 420.22 is: 579.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.09 : 940.80 = 420.22 : x
  2. Step 2: Convert to fraction form
    682.09/940.80 = 420.22/x
  3. Step 3: Cross multiply
    682.09x = 940.80 × 420.22
  4. Step 4: Simplify right side
    682.09x = 395,342.98
  5. Step 5: Solve for x
    x = 395,342.98/682.09
  6. Step 6: Final answer
    x = 579.61

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.