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Finding the Fourth Proportional to 920.85, 1,380.97 and 304.41

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Solution

The fourth proportional to 920.85, 1,380.97 and 304.41 is: 456.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.85 : 1,380.97 = 304.41 : x
  2. Step 2: Convert to fraction form
    920.85/1,380.97 = 304.41/x
  3. Step 3: Cross multiply
    920.85x = 1,380.97 × 304.41
  4. Step 4: Simplify right side
    920.85x = 420,381.08
  5. Step 5: Solve for x
    x = 420,381.08/920.85
  6. Step 6: Final answer
    x = 456.51

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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.