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Finding the Fourth Proportional to 286.18, 428.97 and 188.56

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Solution

The fourth proportional to 286.18, 428.97 and 188.56 is: 282.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.18 : 428.97 = 188.56 : x
  2. Step 2: Convert to fraction form
    286.18/428.97 = 188.56/x
  3. Step 3: Cross multiply
    286.18x = 428.97 × 188.56
  4. Step 4: Simplify right side
    286.18x = 80,886.58
  5. Step 5: Solve for x
    x = 80,886.58/286.18
  6. Step 6: Final answer
    x = 282.64

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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.