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Finding the Fourth Proportional to 920.67, 1,380.79 and 271.45

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Solution

The fourth proportional to 920.67, 1,380.79 and 271.45 is: 407.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.67 : 1,380.79 = 271.45 : x
  2. Step 2: Convert to fraction form
    920.67/1,380.79 = 271.45/x
  3. Step 3: Cross multiply
    920.67x = 1,380.79 × 271.45
  4. Step 4: Simplify right side
    920.67x = 374,815.45
  5. Step 5: Solve for x
    x = 374,815.45/920.67
  6. Step 6: Final answer
    x = 407.11

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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.