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Finding the Fourth Proportional to 131.27, 179.94 and 128.94

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Solution

The fourth proportional to 131.27, 179.94 and 128.94 is: 176.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.27 : 179.94 = 128.94 : x
  2. Step 2: Convert to fraction form
    131.27/179.94 = 128.94/x
  3. Step 3: Cross multiply
    131.27x = 179.94 × 128.94
  4. Step 4: Simplify right side
    131.27x = 23,200.79
  5. Step 5: Solve for x
    x = 23,200.79/131.27
  6. Step 6: Final answer
    x = 176.75

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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.