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Finding the Fourth Proportional to 144.63, 216.68 and 128.43

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Solution

The fourth proportional to 144.63, 216.68 and 128.43 is: 192.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.63 : 216.68 = 128.43 : x
  2. Step 2: Convert to fraction form
    144.63/216.68 = 128.43/x
  3. Step 3: Cross multiply
    144.63x = 216.68 × 128.43
  4. Step 4: Simplify right side
    144.63x = 27,827.57
  5. Step 5: Solve for x
    x = 27,827.57/144.63
  6. Step 6: Final answer
    x = 192.41

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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.