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Finding the Fourth Proportional to 305.92, 421.92 and 223.12

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Solution

The fourth proportional to 305.92, 421.92 and 223.12 is: 307.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.92 : 421.92 = 223.12 : x
  2. Step 2: Convert to fraction form
    305.92/421.92 = 223.12/x
  3. Step 3: Cross multiply
    305.92x = 421.92 × 223.12
  4. Step 4: Simplify right side
    305.92x = 94,138.79
  5. Step 5: Solve for x
    x = 94,138.79/305.92
  6. Step 6: Final answer
    x = 307.72

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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.