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Finding the Fourth Proportional to 286.76, 394.71 and 211.93

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Solution

The fourth proportional to 286.76, 394.71 and 211.93 is: 291.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.76 : 394.71 = 211.93 : x
  2. Step 2: Convert to fraction form
    286.76/394.71 = 211.93/x
  3. Step 3: Cross multiply
    286.76x = 394.71 × 211.93
  4. Step 4: Simplify right side
    286.76x = 83,650.89
  5. Step 5: Solve for x
    x = 83,650.89/286.76
  6. Step 6: Final answer
    x = 291.71

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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.