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Finding the Fourth Proportional to 281.06, 421.31 and 178.15

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Solution

The fourth proportional to 281.06, 421.31 and 178.15 is: 267.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    281.06 : 421.31 = 178.15 : x
  2. Step 2: Convert to fraction form
    281.06/421.31 = 178.15/x
  3. Step 3: Cross multiply
    281.06x = 421.31 × 178.15
  4. Step 4: Simplify right side
    281.06x = 75,054.57
  5. Step 5: Solve for x
    x = 75,054.57/281.06
  6. Step 6: Final answer
    x = 267.04

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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.