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Finding the Fourth Proportional to 128.44, 177.29 and 113.74

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Solution

The fourth proportional to 128.44, 177.29 and 113.74 is: 156.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.44 : 177.29 = 113.74 : x
  2. Step 2: Convert to fraction form
    128.44/177.29 = 113.74/x
  3. Step 3: Cross multiply
    128.44x = 177.29 × 113.74
  4. Step 4: Simplify right side
    128.44x = 20,164.99
  5. Step 5: Solve for x
    x = 20,164.99/128.44
  6. Step 6: Final answer
    x = 156.99

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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.