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Finding the Fourth Proportional to 128.41, 191.45 and 109.26

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Solution

The fourth proportional to 128.41, 191.45 and 109.26 is: 162.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.41 : 191.45 = 109.26 : x
  2. Step 2: Convert to fraction form
    128.41/191.45 = 109.26/x
  3. Step 3: Cross multiply
    128.41x = 191.45 × 109.26
  4. Step 4: Simplify right side
    128.41x = 20,918.10
  5. Step 5: Solve for x
    x = 20,918.10/128.41
  6. Step 6: Final answer
    x = 162.90

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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.