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Finding the Fourth Proportional to 221.10, 305.13 and 154.83

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Solution

The fourth proportional to 221.10, 305.13 and 154.83 is: 213.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.10 : 305.13 = 154.83 : x
  2. Step 2: Convert to fraction form
    221.10/305.13 = 154.83/x
  3. Step 3: Cross multiply
    221.10x = 305.13 × 154.83
  4. Step 4: Simplify right side
    221.10x = 47,243.28
  5. Step 5: Solve for x
    x = 47,243.28/221.10
  6. Step 6: Final answer
    x = 213.67

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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.