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Finding the Fourth Proportional to 282.20, 389.38 and 171.68

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Solution

The fourth proportional to 282.20, 389.38 and 171.68 is: 236.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    282.20 : 389.38 = 171.68 : x
  2. Step 2: Convert to fraction form
    282.20/389.38 = 171.68/x
  3. Step 3: Cross multiply
    282.20x = 389.38 × 171.68
  4. Step 4: Simplify right side
    282.20x = 66,848.76
  5. Step 5: Solve for x
    x = 66,848.76/282.20
  6. Step 6: Final answer
    x = 236.88

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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.