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Finding the Fourth Proportional to 128.26, 192.06 and 74.06

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Solution

The fourth proportional to 128.26, 192.06 and 74.06 is: 110.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.26 : 192.06 = 74.06 : x
  2. Step 2: Convert to fraction form
    128.26/192.06 = 74.06/x
  3. Step 3: Cross multiply
    128.26x = 192.06 × 74.06
  4. Step 4: Simplify right side
    128.26x = 14,223.96
  5. Step 5: Solve for x
    x = 14,223.96/128.26
  6. Step 6: Final answer
    x = 110.90

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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.