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Finding the Fourth Proportional to 619.21, 927.87 and 345.39

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Solution

The fourth proportional to 619.21, 927.87 and 345.39 is: 517.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.21 : 927.87 = 345.39 : x
  2. Step 2: Convert to fraction form
    619.21/927.87 = 345.39/x
  3. Step 3: Cross multiply
    619.21x = 927.87 × 345.39
  4. Step 4: Simplify right side
    619.21x = 320,477.02
  5. Step 5: Solve for x
    x = 320,477.02/619.21
  6. Step 6: Final answer
    x = 517.56

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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.