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Finding the Fourth Proportional to 755.91, 1,134.25 and 345

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Solution

The fourth proportional to 755.91, 1,134.25 and 345 is: 517.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.91 : 1,134.25 = 345 : x
  2. Step 2: Convert to fraction form
    755.91/1,134.25 = 345/x
  3. Step 3: Cross multiply
    755.91x = 1,134.25 × 345
  4. Step 4: Simplify right side
    755.91x = 391,316.25
  5. Step 5: Solve for x
    x = 391,316.25/755.91
  6. Step 6: Final answer
    x = 517.68

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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.