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Finding the Fourth Proportional to 221.76, 332.82 and 208.98

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Solution

The fourth proportional to 221.76, 332.82 and 208.98 is: 313.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.76 : 332.82 = 208.98 : x
  2. Step 2: Convert to fraction form
    221.76/332.82 = 208.98/x
  3. Step 3: Cross multiply
    221.76x = 332.82 × 208.98
  4. Step 4: Simplify right side
    221.76x = 69,552.72
  5. Step 5: Solve for x
    x = 69,552.72/221.76
  6. Step 6: Final answer
    x = 313.64

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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.