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Finding the Fourth Proportional to 231.28, 346.80 and 128.56

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Solution

The fourth proportional to 231.28, 346.80 and 128.56 is: 192.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.28 : 346.80 = 128.56 : x
  2. Step 2: Convert to fraction form
    231.28/346.80 = 128.56/x
  3. Step 3: Cross multiply
    231.28x = 346.80 × 128.56
  4. Step 4: Simplify right side
    231.28x = 44,584.61
  5. Step 5: Solve for x
    x = 44,584.61/231.28
  6. Step 6: Final answer
    x = 192.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.