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Finding the Fourth Proportional to 345.40, 517.89 and 235.85

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Solution

The fourth proportional to 345.40, 517.89 and 235.85 is: 353.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    345.40 : 517.89 = 235.85 : x
  2. Step 2: Convert to fraction form
    345.40/517.89 = 235.85/x
  3. Step 3: Cross multiply
    345.40x = 517.89 × 235.85
  4. Step 4: Simplify right side
    345.40x = 122,142.65
  5. Step 5: Solve for x
    x = 122,142.65/345.40
  6. Step 6: Final answer
    x = 353.63

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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.