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Finding the Fourth Proportional to 836.43, 1,254.45 and 281.21

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Solution

The fourth proportional to 836.43, 1,254.45 and 281.21 is: 421.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    836.43 : 1,254.45 = 281.21 : x
  2. Step 2: Convert to fraction form
    836.43/1,254.45 = 281.21/x
  3. Step 3: Cross multiply
    836.43x = 1,254.45 × 281.21
  4. Step 4: Simplify right side
    836.43x = 352,763.88
  5. Step 5: Solve for x
    x = 352,763.88/836.43
  6. Step 6: Final answer
    x = 421.75

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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.