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Finding the Fourth Proportional to 243.99, 365.31 and 209.25

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Solution

The fourth proportional to 243.99, 365.31 and 209.25 is: 313.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.99 : 365.31 = 209.25 : x
  2. Step 2: Convert to fraction form
    243.99/365.31 = 209.25/x
  3. Step 3: Cross multiply
    243.99x = 365.31 × 209.25
  4. Step 4: Simplify right side
    243.99x = 76,441.12
  5. Step 5: Solve for x
    x = 76,441.12/243.99
  6. Step 6: Final answer
    x = 313.30

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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.