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Finding the Fourth Proportional to 613.97, 919.36 and 339.49

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Solution

The fourth proportional to 613.97, 919.36 and 339.49 is: 508.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.97 : 919.36 = 339.49 : x
  2. Step 2: Convert to fraction form
    613.97/919.36 = 339.49/x
  3. Step 3: Cross multiply
    613.97x = 919.36 × 339.49
  4. Step 4: Simplify right side
    613.97x = 312,113.53
  5. Step 5: Solve for x
    x = 312,113.53/613.97
  6. Step 6: Final answer
    x = 508.35

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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.