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Finding the Fourth Proportional to 920.50, 1,380.79 and 271.29

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Solution

The fourth proportional to 920.50, 1,380.79 and 271.29 is: 406.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.50 : 1,380.79 = 271.29 : x
  2. Step 2: Convert to fraction form
    920.50/1,380.79 = 271.29/x
  3. Step 3: Cross multiply
    920.50x = 1,380.79 × 271.29
  4. Step 4: Simplify right side
    920.50x = 374,594.52
  5. Step 5: Solve for x
    x = 374,594.52/920.50
  6. Step 6: Final answer
    x = 406.95

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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.