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Finding the Fourth Proportional to 144.38, 216.61 and 128.82

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Solution

The fourth proportional to 144.38, 216.61 and 128.82 is: 193.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.38 : 216.61 = 128.82 : x
  2. Step 2: Convert to fraction form
    144.38/216.61 = 128.82/x
  3. Step 3: Cross multiply
    144.38x = 216.61 × 128.82
  4. Step 4: Simplify right side
    144.38x = 27,904.19
  5. Step 5: Solve for x
    x = 27,904.19/144.38
  6. Step 6: Final answer
    x = 193.27

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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.