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Finding the Fourth Proportional to 618.97, 928.48 and 445.15

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Solution

The fourth proportional to 618.97, 928.48 and 445.15 is: 667.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.97 : 928.48 = 445.15 : x
  2. Step 2: Convert to fraction form
    618.97/928.48 = 445.15/x
  3. Step 3: Cross multiply
    618.97x = 928.48 × 445.15
  4. Step 4: Simplify right side
    618.97x = 413,312.87
  5. Step 5: Solve for x
    x = 413,312.87/618.97
  6. Step 6: Final answer
    x = 667.75

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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.