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Finding the Fourth Proportional to 677.98, 1,016.98 and 215.78

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Solution

The fourth proportional to 677.98, 1,016.98 and 215.78 is: 323.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.98 : 1,016.98 = 215.78 : x
  2. Step 2: Convert to fraction form
    677.98/1,016.98 = 215.78/x
  3. Step 3: Cross multiply
    677.98x = 1,016.98 × 215.78
  4. Step 4: Simplify right side
    677.98x = 219,443.94
  5. Step 5: Solve for x
    x = 219,443.94/677.98
  6. Step 6: Final answer
    x = 323.67

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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.