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Finding the Fourth Proportional to 128.69, 177.19 and 114.82

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Solution

The fourth proportional to 128.69, 177.19 and 114.82 is: 158.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.69 : 177.19 = 114.82 : x
  2. Step 2: Convert to fraction form
    128.69/177.19 = 114.82/x
  3. Step 3: Cross multiply
    128.69x = 177.19 × 114.82
  4. Step 4: Simplify right side
    128.69x = 20,344.23
  5. Step 5: Solve for x
    x = 20,344.23/128.69
  6. Step 6: Final answer
    x = 158.09

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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.