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Finding the Fourth Proportional to 128.86, 194.53 and 128.14

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Solution

The fourth proportional to 128.86, 194.53 and 128.14 is: 193.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.86 : 194.53 = 128.14 : x
  2. Step 2: Convert to fraction form
    128.86/194.53 = 128.14/x
  3. Step 3: Cross multiply
    128.86x = 194.53 × 128.14
  4. Step 4: Simplify right side
    128.86x = 24,926.43
  5. Step 5: Solve for x
    x = 24,926.43/128.86
  6. Step 6: Final answer
    x = 193.44

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.