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Finding the Fourth Proportional to 168.03, 231.57 and 128.70

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Solution

The fourth proportional to 168.03, 231.57 and 128.70 is: 177.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.03 : 231.57 = 128.70 : x
  2. Step 2: Convert to fraction form
    168.03/231.57 = 128.70/x
  3. Step 3: Cross multiply
    168.03x = 231.57 × 128.70
  4. Step 4: Simplify right side
    168.03x = 29,803.06
  5. Step 5: Solve for x
    x = 29,803.06/168.03
  6. Step 6: Final answer
    x = 177.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.