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Finding the Fourth Proportional to 281.18, 387.42 and 215.48

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Solution

The fourth proportional to 281.18, 387.42 and 215.48 is: 296.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.18 : 387.42 = 215.48 : x
  2. Step 2: Convert to fraction form
    281.18/387.42 = 215.48/x
  3. Step 3: Cross multiply
    281.18x = 387.42 × 215.48
  4. Step 4: Simplify right side
    281.18x = 83,481.26
  5. Step 5: Solve for x
    x = 83,481.26/281.18
  6. Step 6: Final answer
    x = 296.90

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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.