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Finding the Fourth Proportional to 445.86, 616.65 and 399.15

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Solution

The fourth proportional to 445.86, 616.65 and 399.15 is: 552.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.86 : 616.65 = 399.15 : x
  2. Step 2: Convert to fraction form
    445.86/616.65 = 399.15/x
  3. Step 3: Cross multiply
    445.86x = 616.65 × 399.15
  4. Step 4: Simplify right side
    445.86x = 246,135.85
  5. Step 5: Solve for x
    x = 246,135.85/445.86
  6. Step 6: Final answer
    x = 552.05

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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.