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Finding the Fourth Proportional to 949.11, 1,310.40 and 729.21

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Solution

The fourth proportional to 949.11, 1,310.40 and 729.21 is: 1,006.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.11 : 1,310.40 = 729.21 : x
  2. Step 2: Convert to fraction form
    949.11/1,310.40 = 729.21/x
  3. Step 3: Cross multiply
    949.11x = 1,310.40 × 729.21
  4. Step 4: Simplify right side
    949.11x = 955,556.78
  5. Step 5: Solve for x
    x = 955,556.78/949.11
  6. Step 6: Final answer
    x = 1,006.79

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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.