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Finding the Fourth Proportional to 411.98, 617.98 and 165.30

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Solution

The fourth proportional to 411.98, 617.98 and 165.30 is: 247.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.98 : 617.98 = 165.30 : x
  2. Step 2: Convert to fraction form
    411.98/617.98 = 165.30/x
  3. Step 3: Cross multiply
    411.98x = 617.98 × 165.30
  4. Step 4: Simplify right side
    411.98x = 102,150.28
  5. Step 5: Solve for x
    x = 102,150.28/411.98
  6. Step 6: Final answer
    x = 247.95

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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.