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Finding the Fourth Proportional to 621.45, 928.62 and 447.30

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Solution

The fourth proportional to 621.45, 928.62 and 447.30 is: 668.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    621.45 : 928.62 = 447.30 : x
  2. Step 2: Convert to fraction form
    621.45/928.62 = 447.30/x
  3. Step 3: Cross multiply
    621.45x = 928.62 × 447.30
  4. Step 4: Simplify right side
    621.45x = 415,371.73
  5. Step 5: Solve for x
    x = 415,371.73/621.45
  6. Step 6: Final answer
    x = 668.39

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.