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Finding the Fourth Proportional to 286.95, 396.18 and 188.88

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Solution

The fourth proportional to 286.95, 396.18 and 188.88 is: 260.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.95 : 396.18 = 188.88 : x
  2. Step 2: Convert to fraction form
    286.95/396.18 = 188.88/x
  3. Step 3: Cross multiply
    286.95x = 396.18 × 188.88
  4. Step 4: Simplify right side
    286.95x = 74,830.48
  5. Step 5: Solve for x
    x = 74,830.48/286.95
  6. Step 6: Final answer
    x = 260.78

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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.