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Finding the Fourth Proportional to 304.71, 420.69 and 211.42

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Solution

The fourth proportional to 304.71, 420.69 and 211.42 is: 291.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.71 : 420.69 = 211.42 : x
  2. Step 2: Convert to fraction form
    304.71/420.69 = 211.42/x
  3. Step 3: Cross multiply
    304.71x = 420.69 × 211.42
  4. Step 4: Simplify right side
    304.71x = 88,942.28
  5. Step 5: Solve for x
    x = 88,942.28/304.71
  6. Step 6: Final answer
    x = 291.90

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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.