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Finding the Fourth Proportional to 221.48, 305.78 and 142.83

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Solution

The fourth proportional to 221.48, 305.78 and 142.83 is: 197.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.48 : 305.78 = 142.83 : x
  2. Step 2: Convert to fraction form
    221.48/305.78 = 142.83/x
  3. Step 3: Cross multiply
    221.48x = 305.78 × 142.83
  4. Step 4: Simplify right side
    221.48x = 43,673.77
  5. Step 5: Solve for x
    x = 43,673.77/221.48
  6. Step 6: Final answer
    x = 197.19

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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.