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Finding the Fourth Proportional to 282.21, 422.95 and 127.98

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Solution

The fourth proportional to 282.21, 422.95 and 127.98 is: 191.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.21 : 422.95 = 127.98 : x
  2. Step 2: Convert to fraction form
    282.21/422.95 = 127.98/x
  3. Step 3: Cross multiply
    282.21x = 422.95 × 127.98
  4. Step 4: Simplify right side
    282.21x = 54,129.14
  5. Step 5: Solve for x
    x = 54,129.14/282.21
  6. Step 6: Final answer
    x = 191.80

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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.