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Finding the Fourth Proportional to 613.90, 921 and 504.39

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Solution

The fourth proportional to 613.90, 921 and 504.39 is: 756.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.90 : 921 = 504.39 : x
  2. Step 2: Convert to fraction form
    613.90/921 = 504.39/x
  3. Step 3: Cross multiply
    613.90x = 921 × 504.39
  4. Step 4: Simplify right side
    613.90x = 464,540.89
  5. Step 5: Solve for x
    x = 464,540.89/613.90
  6. Step 6: Final answer
    x = 756.71

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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.