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Finding the Fourth Proportional to 281.33, 388.21 and 157.00

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Solution

The fourth proportional to 281.33, 388.21 and 157.00 is: 216.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.33 : 388.21 = 157.00 : x
  2. Step 2: Convert to fraction form
    281.33/388.21 = 157.00/x
  3. Step 3: Cross multiply
    281.33x = 388.21 × 157.00
  4. Step 4: Simplify right side
    281.33x = 60,947.42
  5. Step 5: Solve for x
    x = 60,947.42/281.33
  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.