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Finding the Fourth Proportional to 281.81, 388.87 and 157.47

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Solution

The fourth proportional to 281.81, 388.87 and 157.47 is: 217.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.81 : 388.87 = 157.47 : x
  2. Step 2: Convert to fraction form
    281.81/388.87 = 157.47/x
  3. Step 3: Cross multiply
    281.81x = 388.87 × 157.47
  4. Step 4: Simplify right side
    281.81x = 61,234.57
  5. Step 5: Solve for x
    x = 61,234.57/281.81
  6. Step 6: Final answer
    x = 217.29

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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.