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Finding the Fourth Proportional to 849.20, 1,273.72 and 271.92

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Solution

The fourth proportional to 849.20, 1,273.72 and 271.92 is: 407.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    849.20 : 1,273.72 = 271.92 : x
  2. Step 2: Convert to fraction form
    849.20/1,273.72 = 271.92/x
  3. Step 3: Cross multiply
    849.20x = 1,273.72 × 271.92
  4. Step 4: Simplify right side
    849.20x = 346,349.94
  5. Step 5: Solve for x
    x = 346,349.94/849.20
  6. Step 6: Final answer
    x = 407.85

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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.