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Finding the Fourth Proportional to 281.31, 388.22 and 156.98

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Solution

The fourth proportional to 281.31, 388.22 and 156.98 is: 216.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.31 : 388.22 = 156.98 : x
  2. Step 2: Convert to fraction form
    281.31/388.22 = 156.98/x
  3. Step 3: Cross multiply
    281.31x = 388.22 × 156.98
  4. Step 4: Simplify right side
    281.31x = 60,942.78
  5. Step 5: Solve for x
    x = 60,942.78/281.31
  6. Step 6: Final answer
    x = 216.64

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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.