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Finding the Fourth Proportional to 305.24, 421.08 and 217.76

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Solution

The fourth proportional to 305.24, 421.08 and 217.76 is: 300.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    305.24 : 421.08 = 217.76 : x
  2. Step 2: Convert to fraction form
    305.24/421.08 = 217.76/x
  3. Step 3: Cross multiply
    305.24x = 421.08 × 217.76
  4. Step 4: Simplify right side
    305.24x = 91,694.38
  5. Step 5: Solve for x
    x = 91,694.38/305.24
  6. Step 6: Final answer
    x = 300.40

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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.