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Finding the Fourth Proportional to 221.70, 305.90 and 147

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Solution

The fourth proportional to 221.70, 305.90 and 147 is: 202.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.70 : 305.90 = 147 : x
  2. Step 2: Convert to fraction form
    221.70/305.90 = 147/x
  3. Step 3: Cross multiply
    221.70x = 305.90 × 147
  4. Step 4: Simplify right side
    221.70x = 44,967.30
  5. Step 5: Solve for x
    x = 44,967.30/221.70
  6. Step 6: Final answer
    x = 202.83

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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.