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Finding the Fourth Proportional to 281.76, 389.06 and 211.91

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Solution

The fourth proportional to 281.76, 389.06 and 211.91 is: 292.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.76 : 389.06 = 211.91 : x
  2. Step 2: Convert to fraction form
    281.76/389.06 = 211.91/x
  3. Step 3: Cross multiply
    281.76x = 389.06 × 211.91
  4. Step 4: Simplify right side
    281.76x = 82,442.70
  5. Step 5: Solve for x
    x = 82,442.70/281.76
  6. Step 6: Final answer
    x = 292.60

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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.