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Finding the Fourth Proportional to 281.09, 421.56 and 116.55

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Solution

The fourth proportional to 281.09, 421.56 and 116.55 is: 174.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.09 : 421.56 = 116.55 : x
  2. Step 2: Convert to fraction form
    281.09/421.56 = 116.55/x
  3. Step 3: Cross multiply
    281.09x = 421.56 × 116.55
  4. Step 4: Simplify right side
    281.09x = 49,132.82
  5. Step 5: Solve for x
    x = 49,132.82/281.09
  6. Step 6: Final answer
    x = 174.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.