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Finding the Fourth Proportional to 613.85, 919.35 and 439.43

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Solution

The fourth proportional to 613.85, 919.35 and 439.43 is: 658.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.85 : 919.35 = 439.43 : x
  2. Step 2: Convert to fraction form
    613.85/919.35 = 439.43/x
  3. Step 3: Cross multiply
    613.85x = 919.35 × 439.43
  4. Step 4: Simplify right side
    613.85x = 403,985.37
  5. Step 5: Solve for x
    x = 403,985.37/613.85
  6. Step 6: Final answer
    x = 658.12

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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.