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Finding the Fourth Proportional to 305.23, 421.17 and 180.89

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Solution

The fourth proportional to 305.23, 421.17 and 180.89 is: 249.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.23 : 421.17 = 180.89 : x
  2. Step 2: Convert to fraction form
    305.23/421.17 = 180.89/x
  3. Step 3: Cross multiply
    305.23x = 421.17 × 180.89
  4. Step 4: Simplify right side
    305.23x = 76,185.44
  5. Step 5: Solve for x
    x = 76,185.44/305.23
  6. Step 6: Final answer
    x = 249.60

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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.