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Finding the Fourth Proportional to 231.36, 346.78 and 128.70

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Solution

The fourth proportional to 231.36, 346.78 and 128.70 is: 192.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.36 : 346.78 = 128.70 : x
  2. Step 2: Convert to fraction form
    231.36/346.78 = 128.70/x
  3. Step 3: Cross multiply
    231.36x = 346.78 × 128.70
  4. Step 4: Simplify right side
    231.36x = 44,630.59
  5. Step 5: Solve for x
    x = 44,630.59/231.36
  6. Step 6: Final answer
    x = 192.91

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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.