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Finding the Fourth Proportional to 144.10, 215.98 and 128.73

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Solution

The fourth proportional to 144.10, 215.98 and 128.73 is: 192.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.10 : 215.98 = 128.73 : x
  2. Step 2: Convert to fraction form
    144.10/215.98 = 128.73/x
  3. Step 3: Cross multiply
    144.10x = 215.98 × 128.73
  4. Step 4: Simplify right side
    144.10x = 27,802.26
  5. Step 5: Solve for x
    x = 27,802.26/144.10
  6. Step 6: Final answer
    x = 192.93

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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.