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Finding the Fourth Proportional to 681.99, 940.86 and 445.86

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Solution

The fourth proportional to 681.99, 940.86 and 445.86 is: 615.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.99 : 940.86 = 445.86 : x
  2. Step 2: Convert to fraction form
    681.99/940.86 = 445.86/x
  3. Step 3: Cross multiply
    681.99x = 940.86 × 445.86
  4. Step 4: Simplify right side
    681.99x = 419,491.84
  5. Step 5: Solve for x
    x = 419,491.84/681.99
  6. Step 6: Final answer
    x = 615.10

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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.