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Finding the Fourth Proportional to 941.76, 1,299.96 and 721.44

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Solution

The fourth proportional to 941.76, 1,299.96 and 721.44 is: 995.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.76 : 1,299.96 = 721.44 : x
  2. Step 2: Convert to fraction form
    941.76/1,299.96 = 721.44/x
  3. Step 3: Cross multiply
    941.76x = 1,299.96 × 721.44
  4. Step 4: Simplify right side
    941.76x = 937,843.14
  5. Step 5: Solve for x
    x = 937,843.14/941.76
  6. Step 6: Final answer
    x = 995.84

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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.