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Finding the Fourth Proportional to 128.32, 192.51 and 111.92

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Solution

The fourth proportional to 128.32, 192.51 and 111.92 is: 167.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.32 : 192.51 = 111.92 : x
  2. Step 2: Convert to fraction form
    128.32/192.51 = 111.92/x
  3. Step 3: Cross multiply
    128.32x = 192.51 × 111.92
  4. Step 4: Simplify right side
    128.32x = 21,544.76
  5. Step 5: Solve for x
    x = 21,544.76/128.32
  6. Step 6: Final answer
    x = 167.90

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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.