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Finding the Fourth Proportional to 128.53, 191.65 and 126.94

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Solution

The fourth proportional to 128.53, 191.65 and 126.94 is: 189.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.53 : 191.65 = 126.94 : x
  2. Step 2: Convert to fraction form
    128.53/191.65 = 126.94/x
  3. Step 3: Cross multiply
    128.53x = 191.65 × 126.94
  4. Step 4: Simplify right side
    128.53x = 24,327.09
  5. Step 5: Solve for x
    x = 24,327.09/128.53
  6. Step 6: Final answer
    x = 189.27

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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.