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Finding the Fourth Proportional to 681.46, 939.86 and 445.39

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Solution

The fourth proportional to 681.46, 939.86 and 445.39 is: 614.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.46 : 939.86 = 445.39 : x
  2. Step 2: Convert to fraction form
    681.46/939.86 = 445.39/x
  3. Step 3: Cross multiply
    681.46x = 939.86 × 445.39
  4. Step 4: Simplify right side
    681.46x = 418,599.55
  5. Step 5: Solve for x
    x = 418,599.55/681.46
  6. Step 6: Final answer
    x = 614.27

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Double scale
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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.