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Finding the Fourth Proportional to 128.53, 177.69 and 113.14

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Solution

The fourth proportional to 128.53, 177.69 and 113.14 is: 156.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.53 : 177.69 = 113.14 : x
  2. Step 2: Convert to fraction form
    128.53/177.69 = 113.14/x
  3. Step 3: Cross multiply
    128.53x = 177.69 × 113.14
  4. Step 4: Simplify right side
    128.53x = 20,103.85
  5. Step 5: Solve for x
    x = 20,103.85/128.53
  6. Step 6: Final answer
    x = 156.41

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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.