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Finding the Fourth Proportional to 304.91, 420.75 and 211.76

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Solution

The fourth proportional to 304.91, 420.75 and 211.76 is: 292.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    304.91 : 420.75 = 211.76 : x
  2. Step 2: Convert to fraction form
    304.91/420.75 = 211.76/x
  3. Step 3: Cross multiply
    304.91x = 420.75 × 211.76
  4. Step 4: Simplify right side
    304.91x = 89,095.92
  5. Step 5: Solve for x
    x = 89,095.92/304.91
  6. Step 6: Final answer
    x = 292.21

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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.