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Finding the Fourth Proportional to 942.80, 1,299.08 and 721.36

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Solution

The fourth proportional to 942.80, 1,299.08 and 721.36 is: 993.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.80 : 1,299.08 = 721.36 : x
  2. Step 2: Convert to fraction form
    942.80/1,299.08 = 721.36/x
  3. Step 3: Cross multiply
    942.80x = 1,299.08 × 721.36
  4. Step 4: Simplify right side
    942.80x = 937,104.35
  5. Step 5: Solve for x
    x = 937,104.35/942.80
  6. Step 6: Final answer
    x = 993.96

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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.