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Finding the Fourth Proportional to 451.35, 676.96 and 143.21

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Solution

The fourth proportional to 451.35, 676.96 and 143.21 is: 214.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.35 : 676.96 = 143.21 : x
  2. Step 2: Convert to fraction form
    451.35/676.96 = 143.21/x
  3. Step 3: Cross multiply
    451.35x = 676.96 × 143.21
  4. Step 4: Simplify right side
    451.35x = 96,948.78
  5. Step 5: Solve for x
    x = 96,948.78/451.35
  6. Step 6: Final answer
    x = 214.80

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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.