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Finding the Fourth Proportional to 345.46, 517.97 and 128.94

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Solution

The fourth proportional to 345.46, 517.97 and 128.94 is: 193.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.46 : 517.97 = 128.94 : x
  2. Step 2: Convert to fraction form
    345.46/517.97 = 128.94/x
  3. Step 3: Cross multiply
    345.46x = 517.97 × 128.94
  4. Step 4: Simplify right side
    345.46x = 66,787.05
  5. Step 5: Solve for x
    x = 66,787.05/345.46
  6. Step 6: Final answer
    x = 193.33

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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.