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Finding the Fourth Proportional to 304.66, 420.42 and 217.36

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Solution

The fourth proportional to 304.66, 420.42 and 217.36 is: 299.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.66 : 420.42 = 217.36 : x
  2. Step 2: Convert to fraction form
    304.66/420.42 = 217.36/x
  3. Step 3: Cross multiply
    304.66x = 420.42 × 217.36
  4. Step 4: Simplify right side
    304.66x = 91,382.49
  5. Step 5: Solve for x
    x = 91,382.49/304.66
  6. Step 6: Final answer
    x = 299.95

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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.