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Finding the Fourth Proportional to 286.07, 394.77 and 161.72

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Solution

The fourth proportional to 286.07, 394.77 and 161.72 is: 223.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.07 : 394.77 = 161.72 : x
  2. Step 2: Convert to fraction form
    286.07/394.77 = 161.72/x
  3. Step 3: Cross multiply
    286.07x = 394.77 × 161.72
  4. Step 4: Simplify right side
    286.07x = 63,842.20
  5. Step 5: Solve for x
    x = 63,842.20/286.07
  6. Step 6: Final answer
    x = 223.17

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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.