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Finding the Fourth Proportional to 451, 676.42 and 126.40

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Solution

The fourth proportional to 451, 676.42 and 126.40 is: 189.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    451 : 676.42 = 126.40 : x
  2. Step 2: Convert to fraction form
    451/676.42 = 126.40/x
  3. Step 3: Cross multiply
    451x = 676.42 × 126.40
  4. Step 4: Simplify right side
    451x = 85,499.49
  5. Step 5: Solve for x
    x = 85,499.49/451
  6. Step 6: Final answer
    x = 189.58

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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.