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Finding the Fourth Proportional to 230.36, 318.21 and 209.60

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Solution

The fourth proportional to 230.36, 318.21 and 209.60 is: 289.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    230.36 : 318.21 = 209.60 : x
  2. Step 2: Convert to fraction form
    230.36/318.21 = 209.60/x
  3. Step 3: Cross multiply
    230.36x = 318.21 × 209.60
  4. Step 4: Simplify right side
    230.36x = 66,695.22
  5. Step 5: Solve for x
    x = 66,695.22/230.36
  6. Step 6: Final answer
    x = 289.53

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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.