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Finding the Fourth Proportional to 306.73, 423.21 and 208.75

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Solution

The fourth proportional to 306.73, 423.21 and 208.75 is: 288.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.73 : 423.21 = 208.75 : x
  2. Step 2: Convert to fraction form
    306.73/423.21 = 208.75/x
  3. Step 3: Cross multiply
    306.73x = 423.21 × 208.75
  4. Step 4: Simplify right side
    306.73x = 88,345.09
  5. Step 5: Solve for x
    x = 88,345.09/306.73
  6. Step 6: Final answer
    x = 288.02

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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.