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Finding the Fourth Proportional to 738.39, 1,107.75 and 218.39

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Solution

The fourth proportional to 738.39, 1,107.75 and 218.39 is: 327.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.39 : 1,107.75 = 218.39 : x
  2. Step 2: Convert to fraction form
    738.39/1,107.75 = 218.39/x
  3. Step 3: Cross multiply
    738.39x = 1,107.75 × 218.39
  4. Step 4: Simplify right side
    738.39x = 241,915.98
  5. Step 5: Solve for x
    x = 241,915.98/738.39
  6. Step 6: Final answer
    x = 327.63

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.