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Finding the Fourth Proportional to 618.35, 928.14 and 445.21

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Solution

The fourth proportional to 618.35, 928.14 and 445.21 is: 668.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.35 : 928.14 = 445.21 : x
  2. Step 2: Convert to fraction form
    618.35/928.14 = 445.21/x
  3. Step 3: Cross multiply
    618.35x = 928.14 × 445.21
  4. Step 4: Simplify right side
    618.35x = 413,213.22
  5. Step 5: Solve for x
    x = 413,213.22/618.35
  6. Step 6: Final answer
    x = 668.26

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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.