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Finding the Fourth Proportional to 451.28, 676.68 and 143.05

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Solution

The fourth proportional to 451.28, 676.68 and 143.05 is: 214.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.28 : 676.68 = 143.05 : x
  2. Step 2: Convert to fraction form
    451.28/676.68 = 143.05/x
  3. Step 3: Cross multiply
    451.28x = 676.68 × 143.05
  4. Step 4: Simplify right side
    451.28x = 96,799.07
  5. Step 5: Solve for x
    x = 96,799.07/451.28
  6. Step 6: Final answer
    x = 214.50

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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.