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Finding the Fourth Proportional to 286.70, 395.66 and 155.72

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Solution

The fourth proportional to 286.70, 395.66 and 155.72 is: 214.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.70 : 395.66 = 155.72 : x
  2. Step 2: Convert to fraction form
    286.70/395.66 = 155.72/x
  3. Step 3: Cross multiply
    286.70x = 395.66 × 155.72
  4. Step 4: Simplify right side
    286.70x = 61,611.98
  5. Step 5: Solve for x
    x = 61,611.98/286.70
  6. Step 6: Final answer
    x = 214.90

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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.