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Finding the Fourth Proportional to 408.99, 613.49 and 100.85

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Solution

The fourth proportional to 408.99, 613.49 and 100.85 is: 151.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.99 : 613.49 = 100.85 : x
  2. Step 2: Convert to fraction form
    408.99/613.49 = 100.85/x
  3. Step 3: Cross multiply
    408.99x = 613.49 × 100.85
  4. Step 4: Simplify right side
    408.99x = 61,866.89
  5. Step 5: Solve for x
    x = 61,866.89/408.99
  6. Step 6: Final answer
    x = 151.27

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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.