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Finding the Fourth Proportional to 221.30, 305.40 and 147.57

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Solution

The fourth proportional to 221.30, 305.40 and 147.57 is: 203.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.30 : 305.40 = 147.57 : x
  2. Step 2: Convert to fraction form
    221.30/305.40 = 147.57/x
  3. Step 3: Cross multiply
    221.30x = 305.40 × 147.57
  4. Step 4: Simplify right side
    221.30x = 45,067.88
  5. Step 5: Solve for x
    x = 45,067.88/221.30
  6. Step 6: Final answer
    x = 203.65

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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.