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Finding the Fourth Proportional to 920.76, 1,380.96 and 271.56

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Solution

The fourth proportional to 920.76, 1,380.96 and 271.56 is: 407.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    920.76 : 1,380.96 = 271.56 : x
  2. Step 2: Convert to fraction form
    920.76/1,380.96 = 271.56/x
  3. Step 3: Cross multiply
    920.76x = 1,380.96 × 271.56
  4. Step 4: Simplify right side
    920.76x = 375,013.50
  5. Step 5: Solve for x
    x = 375,013.50/920.76
  6. Step 6: Final answer
    x = 407.29

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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.