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Finding the Fourth Proportional to 282.32, 422.96 and 128.01

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Solution

The fourth proportional to 282.32, 422.96 and 128.01 is: 191.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.32 : 422.96 = 128.01 : x
  2. Step 2: Convert to fraction form
    282.32/422.96 = 128.01/x
  3. Step 3: Cross multiply
    282.32x = 422.96 × 128.01
  4. Step 4: Simplify right side
    282.32x = 54,143.11
  5. Step 5: Solve for x
    x = 54,143.11/282.32
  6. Step 6: Final answer
    x = 191.78

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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.