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Finding the Fourth Proportional to 676.78, 1,015.19 and 189.82

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Solution

The fourth proportional to 676.78, 1,015.19 and 189.82 is: 284.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.78 : 1,015.19 = 189.82 : x
  2. Step 2: Convert to fraction form
    676.78/1,015.19 = 189.82/x
  3. Step 3: Cross multiply
    676.78x = 1,015.19 × 189.82
  4. Step 4: Simplify right side
    676.78x = 192,703.37
  5. Step 5: Solve for x
    x = 192,703.37/676.78
  6. Step 6: Final answer
    x = 284.74

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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.