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Finding the Fourth Proportional to 681.35, 940.45 and 419.59

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Solution

The fourth proportional to 681.35, 940.45 and 419.59 is: 579.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.35 : 940.45 = 419.59 : x
  2. Step 2: Convert to fraction form
    681.35/940.45 = 419.59/x
  3. Step 3: Cross multiply
    681.35x = 940.45 × 419.59
  4. Step 4: Simplify right side
    681.35x = 394,598.05
  5. Step 5: Solve for x
    x = 394,598.05/681.35
  6. Step 6: Final answer
    x = 579.14

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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.