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Finding the Fourth Proportional to 451.30, 676.95 and 143.20

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Solution

The fourth proportional to 451.30, 676.95 and 143.20 is: 214.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    451.30 : 676.95 = 143.20 : x
  2. Step 2: Convert to fraction form
    451.30/676.95 = 143.20/x
  3. Step 3: Cross multiply
    451.30x = 676.95 × 143.20
  4. Step 4: Simplify right side
    451.30x = 96,935.14
  5. Step 5: Solve for x
    x = 96,935.14/451.30
  6. Step 6: Final answer
    x = 214.79

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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.