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Finding the Fourth Proportional to 281.55, 422.31 and 127.65

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Solution

The fourth proportional to 281.55, 422.31 and 127.65 is: 191.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.55 : 422.31 = 127.65 : x
  2. Step 2: Convert to fraction form
    281.55/422.31 = 127.65/x
  3. Step 3: Cross multiply
    281.55x = 422.31 × 127.65
  4. Step 4: Simplify right side
    281.55x = 53,907.87
  5. Step 5: Solve for x
    x = 53,907.87/281.55
  6. Step 6: Final answer
    x = 191.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.