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Finding the Fourth Proportional to 221.65, 305.83 and 142.93

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Solution

The fourth proportional to 221.65, 305.83 and 142.93 is: 197.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.65 : 305.83 = 142.93 : x
  2. Step 2: Convert to fraction form
    221.65/305.83 = 142.93/x
  3. Step 3: Cross multiply
    221.65x = 305.83 × 142.93
  4. Step 4: Simplify right side
    221.65x = 43,712.28
  5. Step 5: Solve for x
    x = 43,712.28/221.65
  6. Step 6: Final answer
    x = 197.21

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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.