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Finding the Fourth Proportional to 969.42, 1,336.91 and 721.36

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Solution

The fourth proportional to 969.42, 1,336.91 and 721.36 is: 994.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.42 : 1,336.91 = 721.36 : x
  2. Step 2: Convert to fraction form
    969.42/1,336.91 = 721.36/x
  3. Step 3: Cross multiply
    969.42x = 1,336.91 × 721.36
  4. Step 4: Simplify right side
    969.42x = 964,393.40
  5. Step 5: Solve for x
    x = 964,393.40/969.42
  6. Step 6: Final answer
    x = 994.81

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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.