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Finding the Fourth Proportional to 281.97, 389.12 and 157.61

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Solution

The fourth proportional to 281.97, 389.12 and 157.61 is: 217.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.97 : 389.12 = 157.61 : x
  2. Step 2: Convert to fraction form
    281.97/389.12 = 157.61/x
  3. Step 3: Cross multiply
    281.97x = 389.12 × 157.61
  4. Step 4: Simplify right side
    281.97x = 61,329.39
  5. Step 5: Solve for x
    x = 61,329.39/281.97
  6. Step 6: Final answer
    x = 217.50

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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.