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Finding the Fourth Proportional to 408.86, 612.38 and 399.74

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Solution

The fourth proportional to 408.86, 612.38 and 399.74 is: 598.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.86 : 612.38 = 399.74 : x
  2. Step 2: Convert to fraction form
    408.86/612.38 = 399.74/x
  3. Step 3: Cross multiply
    408.86x = 612.38 × 399.74
  4. Step 4: Simplify right side
    408.86x = 244,792.78
  5. Step 5: Solve for x
    x = 244,792.78/408.86
  6. Step 6: Final answer
    x = 598.72

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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.