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Finding the Fourth Proportional to 305.64, 421.44 and 231.09

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Solution

The fourth proportional to 305.64, 421.44 and 231.09 is: 318.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.64 : 421.44 = 231.09 : x
  2. Step 2: Convert to fraction form
    305.64/421.44 = 231.09/x
  3. Step 3: Cross multiply
    305.64x = 421.44 × 231.09
  4. Step 4: Simplify right side
    305.64x = 97,390.57
  5. Step 5: Solve for x
    x = 97,390.57/305.64
  6. Step 6: Final answer
    x = 318.64

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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.