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Finding the Fourth Proportional to 738.65, 1,107.81 and 218.51

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Solution

The fourth proportional to 738.65, 1,107.81 and 218.51 is: 327.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.65 : 1,107.81 = 218.51 : x
  2. Step 2: Convert to fraction form
    738.65/1,107.81 = 218.51/x
  3. Step 3: Cross multiply
    738.65x = 1,107.81 × 218.51
  4. Step 4: Simplify right side
    738.65x = 242,062.02
  5. Step 5: Solve for x
    x = 242,062.02/738.65
  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.