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Finding the Fourth Proportional to 128.92, 176.96 and 114.80

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Solution

The fourth proportional to 128.92, 176.96 and 114.80 is: 157.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.92 : 176.96 = 114.80 : x
  2. Step 2: Convert to fraction form
    128.92/176.96 = 114.80/x
  3. Step 3: Cross multiply
    128.92x = 176.96 × 114.80
  4. Step 4: Simplify right side
    128.92x = 20,315.01
  5. Step 5: Solve for x
    x = 20,315.01/128.92
  6. Step 6: Final answer
    x = 157.58

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.