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Finding the Fourth Proportional to 304.38, 420.14 and 211.43

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Solution

The fourth proportional to 304.38, 420.14 and 211.43 is: 291.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.38 : 420.14 = 211.43 : x
  2. Step 2: Convert to fraction form
    304.38/420.14 = 211.43/x
  3. Step 3: Cross multiply
    304.38x = 420.14 × 211.43
  4. Step 4: Simplify right side
    304.38x = 88,831.78
  5. Step 5: Solve for x
    x = 88,831.78/304.38
  6. Step 6: Final answer
    x = 291.84

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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.