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Finding the Fourth Proportional to 164.10, 226.20 and 128.86

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Solution

The fourth proportional to 164.10, 226.20 and 128.86 is: 177.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    164.10 : 226.20 = 128.86 : x
  2. Step 2: Convert to fraction form
    164.10/226.20 = 128.86/x
  3. Step 3: Cross multiply
    164.10x = 226.20 × 128.86
  4. Step 4: Simplify right side
    164.10x = 29,148.13
  5. Step 5: Solve for x
    x = 29,148.13/164.10
  6. Step 6: Final answer
    x = 177.62

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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.