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Finding the Fourth Proportional to 281.54, 388.53 and 157.21

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Solution

The fourth proportional to 281.54, 388.53 and 157.21 is: 216.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.54 : 388.53 = 157.21 : x
  2. Step 2: Convert to fraction form
    281.54/388.53 = 157.21/x
  3. Step 3: Cross multiply
    281.54x = 388.53 × 157.21
  4. Step 4: Simplify right side
    281.54x = 61,080.80
  5. Step 5: Solve for x
    x = 61,080.80/281.54
  6. Step 6: Final answer
    x = 216.95

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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.