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Finding the Fourth Proportional to 144.69, 216.90 and 128.49

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Solution

The fourth proportional to 144.69, 216.90 and 128.49 is: 192.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.69 : 216.90 = 128.49 : x
  2. Step 2: Convert to fraction form
    144.69/216.90 = 128.49/x
  3. Step 3: Cross multiply
    144.69x = 216.90 × 128.49
  4. Step 4: Simplify right side
    144.69x = 27,869.48
  5. Step 5: Solve for x
    x = 27,869.48/144.69
  6. Step 6: Final answer
    x = 192.62

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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.