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Finding the Fourth Proportional to 281.98, 389.18 and 171.49

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Solution

The fourth proportional to 281.98, 389.18 and 171.49 is: 236.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.98 : 389.18 = 171.49 : x
  2. Step 2: Convert to fraction form
    281.98/389.18 = 171.49/x
  3. Step 3: Cross multiply
    281.98x = 389.18 × 171.49
  4. Step 4: Simplify right side
    281.98x = 66,740.75
  5. Step 5: Solve for x
    x = 66,740.75/281.98
  6. Step 6: Final answer
    x = 236.69

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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.