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Finding the Fourth Proportional to 677.78, 1,018.03 and 658.64

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Solution

The fourth proportional to 677.78, 1,018.03 and 658.64 is: 989.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.78 : 1,018.03 = 658.64 : x
  2. Step 2: Convert to fraction form
    677.78/1,018.03 = 658.64/x
  3. Step 3: Cross multiply
    677.78x = 1,018.03 × 658.64
  4. Step 4: Simplify right side
    677.78x = 670,508.54
  5. Step 5: Solve for x
    x = 670,508.54/677.78
  6. Step 6: Final answer
    x = 989.28

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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.