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Finding the Fourth Proportional to 287.51, 396.77 and 171

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Solution

The fourth proportional to 287.51, 396.77 and 171 is: 235.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.51 : 396.77 = 171 : x
  2. Step 2: Convert to fraction form
    287.51/396.77 = 171/x
  3. Step 3: Cross multiply
    287.51x = 396.77 × 171
  4. Step 4: Simplify right side
    287.51x = 67,846.82
  5. Step 5: Solve for x
    x = 67,846.82/287.51
  6. Step 6: Final answer
    x = 235.98

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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.