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Finding the Fourth Proportional to 681.45, 939.61 and 445.07

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Solution

The fourth proportional to 681.45, 939.61 and 445.07 is: 613.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.45 : 939.61 = 445.07 : x
  2. Step 2: Convert to fraction form
    681.45/939.61 = 445.07/x
  3. Step 3: Cross multiply
    681.45x = 939.61 × 445.07
  4. Step 4: Simplify right side
    681.45x = 418,186.41
  5. Step 5: Solve for x
    x = 418,186.41/681.45
  6. Step 6: Final answer
    x = 613.67

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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.