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Finding the Fourth Proportional to 286.78, 395.75 and 155.79

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Solution

The fourth proportional to 286.78, 395.75 and 155.79 is: 214.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.78 : 395.75 = 155.79 : x
  2. Step 2: Convert to fraction form
    286.78/395.75 = 155.79/x
  3. Step 3: Cross multiply
    286.78x = 395.75 × 155.79
  4. Step 4: Simplify right side
    286.78x = 61,651.91
  5. Step 5: Solve for x
    x = 61,651.91/286.78
  6. Step 6: Final answer
    x = 214.98

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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.