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Finding the Fourth Proportional to 411.99, 617.99 and 123.45

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Solution

The fourth proportional to 411.99, 617.99 and 123.45 is: 185.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    411.99 : 617.99 = 123.45 : x
  2. Step 2: Convert to fraction form
    411.99/617.99 = 123.45/x
  3. Step 3: Cross multiply
    411.99x = 617.99 × 123.45
  4. Step 4: Simplify right side
    411.99x = 76,290.25
  5. Step 5: Solve for x
    x = 76,290.25/411.99
  6. Step 6: Final answer
    x = 185.18

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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.