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Finding the Fourth Proportional to 411.85, 617.79 and 339.58

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Solution

The fourth proportional to 411.85, 617.79 and 339.58 is: 509.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.85 : 617.79 = 339.58 : x
  2. Step 2: Convert to fraction form
    411.85/617.79 = 339.58/x
  3. Step 3: Cross multiply
    411.85x = 617.79 × 339.58
  4. Step 4: Simplify right side
    411.85x = 209,786.04
  5. Step 5: Solve for x
    x = 209,786.04/411.85
  6. Step 6: Final answer
    x = 509.38

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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.