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Finding the Fourth Proportional to 148.09, 221.73 and 142.87

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Solution

The fourth proportional to 148.09, 221.73 and 142.87 is: 213.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.09 : 221.73 = 142.87 : x
  2. Step 2: Convert to fraction form
    148.09/221.73 = 142.87/x
  3. Step 3: Cross multiply
    148.09x = 221.73 × 142.87
  4. Step 4: Simplify right side
    148.09x = 31,678.57
  5. Step 5: Solve for x
    x = 31,678.57/148.09
  6. Step 6: Final answer
    x = 213.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.