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Finding the Fourth Proportional to 738.50, 1,107.72 and 218.48

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Solution

The fourth proportional to 738.50, 1,107.72 and 218.48 is: 327.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.50 : 1,107.72 = 218.48 : x
  2. Step 2: Convert to fraction form
    738.50/1,107.72 = 218.48/x
  3. Step 3: Cross multiply
    738.50x = 1,107.72 × 218.48
  4. Step 4: Simplify right side
    738.50x = 242,014.67
  5. Step 5: Solve for x
    x = 242,014.67/738.50
  6. Step 6: Final answer
    x = 327.71

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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.