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Finding the Fourth Proportional to 281.63, 388.64 and 157.28

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Solution

The fourth proportional to 281.63, 388.64 and 157.28 is: 217.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.63 : 388.64 = 157.28 : x
  2. Step 2: Convert to fraction form
    281.63/388.64 = 157.28/x
  3. Step 3: Cross multiply
    281.63x = 388.64 × 157.28
  4. Step 4: Simplify right side
    281.63x = 61,123.75
  5. Step 5: Solve for x
    x = 61,123.75/281.63
  6. Step 6: Final answer
    x = 217.03

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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.