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Finding the Fourth Proportional to 738.57, 1,107.85 and 218.57

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Solution

The fourth proportional to 738.57, 1,107.85 and 218.57 is: 327.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.57 : 1,107.85 = 218.57 : x
  2. Step 2: Convert to fraction form
    738.57/1,107.85 = 218.57/x
  3. Step 3: Cross multiply
    738.57x = 1,107.85 × 218.57
  4. Step 4: Simplify right side
    738.57x = 242,147.06
  5. Step 5: Solve for x
    x = 242,147.06/738.57
  6. Step 6: Final answer
    x = 327.86

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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.