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Finding the Fourth Proportional to 305.00, 421.47 and 231.18

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Solution

The fourth proportional to 305.00, 421.47 and 231.18 is: 319.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.00 : 421.47 = 231.18 : x
  2. Step 2: Convert to fraction form
    305.00/421.47 = 231.18/x
  3. Step 3: Cross multiply
    305.00x = 421.47 × 231.18
  4. Step 4: Simplify right side
    305.00x = 97,435.43
  5. Step 5: Solve for x
    x = 97,435.43/305.00
  6. Step 6: Final answer
    x = 319.47

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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.