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Finding the Fourth Proportional to 281.56, 388.65 and 215.98

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Solution

The fourth proportional to 281.56, 388.65 and 215.98 is: 298.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.56 : 388.65 = 215.98 : x
  2. Step 2: Convert to fraction form
    281.56/388.65 = 215.98/x
  3. Step 3: Cross multiply
    281.56x = 388.65 × 215.98
  4. Step 4: Simplify right side
    281.56x = 83,940.63
  5. Step 5: Solve for x
    x = 83,940.63/281.56
  6. Step 6: Final answer
    x = 298.13

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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.