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Finding the Fourth Proportional to 287.76, 397.11 and 171.32

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Solution

The fourth proportional to 287.76, 397.11 and 171.32 is: 236.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.76 : 397.11 = 171.32 : x
  2. Step 2: Convert to fraction form
    287.76/397.11 = 171.32/x
  3. Step 3: Cross multiply
    287.76x = 397.11 × 171.32
  4. Step 4: Simplify right side
    287.76x = 68,030.90
  5. Step 5: Solve for x
    x = 68,030.90/287.76
  6. Step 6: Final answer
    x = 236.42

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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.