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Finding the Fourth Proportional to 128.48, 192.72 and 109.18

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Solution

The fourth proportional to 128.48, 192.72 and 109.18 is: 163.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.48 : 192.72 = 109.18 : x
  2. Step 2: Convert to fraction form
    128.48/192.72 = 109.18/x
  3. Step 3: Cross multiply
    128.48x = 192.72 × 109.18
  4. Step 4: Simplify right side
    128.48x = 21,040.81
  5. Step 5: Solve for x
    x = 21,040.81/128.48
  6. Step 6: Final answer
    x = 163.77

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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.