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Finding the Fourth Proportional to 677, 1,015.50 and 221

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Solution

The fourth proportional to 677, 1,015.50 and 221 is: 331.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    677 : 1,015.50 = 221 : x
  2. Step 2: Convert to fraction form
    677/1,015.50 = 221/x
  3. Step 3: Cross multiply
    677x = 1,015.50 × 221
  4. Step 4: Simplify right side
    677x = 224,425.50
  5. Step 5: Solve for x
    x = 224,425.50/677
  6. Step 6: Final answer
    x = 331.50

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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.