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Finding the Fourth Proportional to 281.82, 388.90 and 157.48

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Solution

The fourth proportional to 281.82, 388.90 and 157.48 is: 217.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.82 : 388.90 = 157.48 : x
  2. Step 2: Convert to fraction form
    281.82/388.90 = 157.48/x
  3. Step 3: Cross multiply
    281.82x = 388.90 × 157.48
  4. Step 4: Simplify right side
    281.82x = 61,242.42
  5. Step 5: Solve for x
    x = 61,242.42/281.82
  6. Step 6: Final answer
    x = 217.31

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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.