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Finding the Fourth Proportional to 669, 1,003.50 and 213

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Solution

The fourth proportional to 669, 1,003.50 and 213 is: 319.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    669 : 1,003.50 = 213 : x
  2. Step 2: Convert to fraction form
    669/1,003.50 = 213/x
  3. Step 3: Cross multiply
    669x = 1,003.50 × 213
  4. Step 4: Simplify right side
    669x = 213,745.50
  5. Step 5: Solve for x
    x = 213,745.50/669
  6. Step 6: Final answer
    x = 319.50

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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.