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Finding the Fourth Proportional to 307.22, 423.31 and 208.81

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Solution

The fourth proportional to 307.22, 423.31 and 208.81 is: 287.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.22 : 423.31 = 208.81 : x
  2. Step 2: Convert to fraction form
    307.22/423.31 = 208.81/x
  3. Step 3: Cross multiply
    307.22x = 423.31 × 208.81
  4. Step 4: Simplify right side
    307.22x = 88,389.78
  5. Step 5: Solve for x
    x = 88,389.78/307.22
  6. Step 6: Final answer
    x = 287.71

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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.