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Finding the Fourth Proportional to 221.21, 305.10 and 137.14

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Solution

The fourth proportional to 221.21, 305.10 and 137.14 is: 189.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.21 : 305.10 = 137.14 : x
  2. Step 2: Convert to fraction form
    221.21/305.10 = 137.14/x
  3. Step 3: Cross multiply
    221.21x = 305.10 × 137.14
  4. Step 4: Simplify right side
    221.21x = 41,841.76
  5. Step 5: Solve for x
    x = 41,841.76/221.21
  6. Step 6: Final answer
    x = 189.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.