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Finding the Fourth Proportional to 221.63, 305.79 and 148.05

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Solution

The fourth proportional to 221.63, 305.79 and 148.05 is: 204.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.63 : 305.79 = 148.05 : x
  2. Step 2: Convert to fraction form
    221.63/305.79 = 148.05/x
  3. Step 3: Cross multiply
    221.63x = 305.79 × 148.05
  4. Step 4: Simplify right side
    221.63x = 45,272.21
  5. Step 5: Solve for x
    x = 45,272.21/221.63
  6. Step 6: Final answer
    x = 204.27

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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.