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Finding the Fourth Proportional to 304.36, 420.14 and 211.12

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Solution

The fourth proportional to 304.36, 420.14 and 211.12 is: 291.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.36 : 420.14 = 211.12 : x
  2. Step 2: Convert to fraction form
    304.36/420.14 = 211.12/x
  3. Step 3: Cross multiply
    304.36x = 420.14 × 211.12
  4. Step 4: Simplify right side
    304.36x = 88,699.96
  5. Step 5: Solve for x
    x = 88,699.96/304.36
  6. Step 6: Final answer
    x = 291.43

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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.