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Finding the Fourth Proportional to 676.72, 1,015.12 and 214.52

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Solution

The fourth proportional to 676.72, 1,015.12 and 214.52 is: 321.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.72 : 1,015.12 = 214.52 : x
  2. Step 2: Convert to fraction form
    676.72/1,015.12 = 214.52/x
  3. Step 3: Cross multiply
    676.72x = 1,015.12 × 214.52
  4. Step 4: Simplify right side
    676.72x = 217,758.47
  5. Step 5: Solve for x
    x = 217,758.47/676.72
  6. Step 6: Final answer
    x = 321.79

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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.