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Finding the Fourth Proportional to 304.88, 421.05 and 211.98

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Solution

The fourth proportional to 304.88, 421.05 and 211.98 is: 292.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.88 : 421.05 = 211.98 : x
  2. Step 2: Convert to fraction form
    304.88/421.05 = 211.98/x
  3. Step 3: Cross multiply
    304.88x = 421.05 × 211.98
  4. Step 4: Simplify right side
    304.88x = 89,255.36
  5. Step 5: Solve for x
    x = 89,255.36/304.88
  6. Step 6: Final answer
    x = 292.76

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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.