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Finding the Fourth Proportional to 681.49, 940.22 and 419.45

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Solution

The fourth proportional to 681.49, 940.22 and 419.45 is: 578.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.49 : 940.22 = 419.45 : x
  2. Step 2: Convert to fraction form
    681.49/940.22 = 419.45/x
  3. Step 3: Cross multiply
    681.49x = 940.22 × 419.45
  4. Step 4: Simplify right side
    681.49x = 394,375.28
  5. Step 5: Solve for x
    x = 394,375.28/681.49
  6. Step 6: Final answer
    x = 578.70

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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.