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Finding the Fourth Proportional to 128.92, 192.67 and 104.90

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Solution

The fourth proportional to 128.92, 192.67 and 104.90 is: 156.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.92 : 192.67 = 104.90 : x
  2. Step 2: Convert to fraction form
    128.92/192.67 = 104.90/x
  3. Step 3: Cross multiply
    128.92x = 192.67 × 104.90
  4. Step 4: Simplify right side
    128.92x = 20,210.56
  5. Step 5: Solve for x
    x = 20,210.56/128.92
  6. Step 6: Final answer
    x = 156.77

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.