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Finding the Fourth Proportional to 304.53, 420.81 and 217.05

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Solution

The fourth proportional to 304.53, 420.81 and 217.05 is: 299.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.53 : 420.81 = 217.05 : x
  2. Step 2: Convert to fraction form
    304.53/420.81 = 217.05/x
  3. Step 3: Cross multiply
    304.53x = 420.81 × 217.05
  4. Step 4: Simplify right side
    304.53x = 91,335.73
  5. Step 5: Solve for x
    x = 91,335.73/304.53
  6. Step 6: Final answer
    x = 299.92

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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.