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Finding the Fourth Proportional to 928.35, 1,391.81 and 441.99

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Solution

The fourth proportional to 928.35, 1,391.81 and 441.99 is: 662.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.35 : 1,391.81 = 441.99 : x
  2. Step 2: Convert to fraction form
    928.35/1,391.81 = 441.99/x
  3. Step 3: Cross multiply
    928.35x = 1,391.81 × 441.99
  4. Step 4: Simplify right side
    928.35x = 615,163.89
  5. Step 5: Solve for x
    x = 615,163.89/928.35
  6. Step 6: Final answer
    x = 662.64

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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.