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Finding the Fourth Proportional to 143.38, 214.81 and 128.22

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Solution

The fourth proportional to 143.38, 214.81 and 128.22 is: 192.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.38 : 214.81 = 128.22 : x
  2. Step 2: Convert to fraction form
    143.38/214.81 = 128.22/x
  3. Step 3: Cross multiply
    143.38x = 214.81 × 128.22
  4. Step 4: Simplify right side
    143.38x = 27,542.94
  5. Step 5: Solve for x
    x = 27,542.94/143.38
  6. Step 6: Final answer
    x = 192.10

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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.