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Finding the Fourth Proportional to 281.23, 387.28 and 218.96

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Solution

The fourth proportional to 281.23, 387.28 and 218.96 is: 301.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.23 : 387.28 = 218.96 : x
  2. Step 2: Convert to fraction form
    281.23/387.28 = 218.96/x
  3. Step 3: Cross multiply
    281.23x = 387.28 × 218.96
  4. Step 4: Simplify right side
    281.23x = 84,798.62
  5. Step 5: Solve for x
    x = 84,798.62/281.23
  6. Step 6: Final answer
    x = 301.52

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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.