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Finding the Fourth Proportional to 940.41, 1,299.90 and 720.34

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Solution

The fourth proportional to 940.41, 1,299.90 and 720.34 is: 995.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.41 : 1,299.90 = 720.34 : x
  2. Step 2: Convert to fraction form
    940.41/1,299.90 = 720.34/x
  3. Step 3: Cross multiply
    940.41x = 1,299.90 × 720.34
  4. Step 4: Simplify right side
    940.41x = 936,372.68
  5. Step 5: Solve for x
    x = 936,372.68/940.41
  6. Step 6: Final answer
    x = 995.71

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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.