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Finding the Fourth Proportional to 221.54, 305.97 and 147.86

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Solution

The fourth proportional to 221.54, 305.97 and 147.86 is: 204.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.54 : 305.97 = 147.86 : x
  2. Step 2: Convert to fraction form
    221.54/305.97 = 147.86/x
  3. Step 3: Cross multiply
    221.54x = 305.97 × 147.86
  4. Step 4: Simplify right side
    221.54x = 45,240.72
  5. Step 5: Solve for x
    x = 45,240.72/221.54
  6. Step 6: Final answer
    x = 204.21

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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.