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Finding the Fourth Proportional to 305.91, 421.61 and 222.89

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Solution

The fourth proportional to 305.91, 421.61 and 222.89 is: 307.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.91 : 421.61 = 222.89 : x
  2. Step 2: Convert to fraction form
    305.91/421.61 = 222.89/x
  3. Step 3: Cross multiply
    305.91x = 421.61 × 222.89
  4. Step 4: Simplify right side
    305.91x = 93,969.43
  5. Step 5: Solve for x
    x = 93,969.43/305.91
  6. Step 6: Final answer
    x = 307.18

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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.