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Finding the Fourth Proportional to 418.99, 578.19 and 229.95

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Solution

The fourth proportional to 418.99, 578.19 and 229.95 is: 317.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.99 : 578.19 = 229.95 : x
  2. Step 2: Convert to fraction form
    418.99/578.19 = 229.95/x
  3. Step 3: Cross multiply
    418.99x = 578.19 × 229.95
  4. Step 4: Simplify right side
    418.99x = 132,951.90
  5. Step 5: Solve for x
    x = 132,951.90/418.99
  6. Step 6: Final answer
    x = 317.32

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.