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Finding the Fourth Proportional to 128.26, 192.30 and 128.20

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Solution

The fourth proportional to 128.26, 192.30 and 128.20 is: 192.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.26 : 192.30 = 128.20 : x
  2. Step 2: Convert to fraction form
    128.26/192.30 = 128.20/x
  3. Step 3: Cross multiply
    128.26x = 192.30 × 128.20
  4. Step 4: Simplify right side
    128.26x = 24,652.86
  5. Step 5: Solve for x
    x = 24,652.86/128.26
  6. Step 6: Final answer
    x = 192.21

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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.