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Finding the Fourth Proportional to 304.74, 420.21 and 217.62

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Solution

The fourth proportional to 304.74, 420.21 and 217.62 is: 300.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.74 : 420.21 = 217.62 : x
  2. Step 2: Convert to fraction form
    304.74/420.21 = 217.62/x
  3. Step 3: Cross multiply
    304.74x = 420.21 × 217.62
  4. Step 4: Simplify right side
    304.74x = 91,446.10
  5. Step 5: Solve for x
    x = 91,446.10/304.74
  6. Step 6: Final answer
    x = 300.08

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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.