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Finding the Fourth Proportional to 942.81, 1,300.35 and 721.26

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Solution

The fourth proportional to 942.81, 1,300.35 and 721.26 is: 994.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    942.81 : 1,300.35 = 721.26 : x
  2. Step 2: Convert to fraction form
    942.81/1,300.35 = 721.26/x
  3. Step 3: Cross multiply
    942.81x = 1,300.35 × 721.26
  4. Step 4: Simplify right side
    942.81x = 937,890.44
  5. Step 5: Solve for x
    x = 937,890.44/942.81
  6. Step 6: Final answer
    x = 994.78

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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.