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Finding the Fourth Proportional to 851.94, 1,278.08 and 331.92

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Solution

The fourth proportional to 851.94, 1,278.08 and 331.92 is: 497.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.94 : 1,278.08 = 331.92 : x
  2. Step 2: Convert to fraction form
    851.94/1,278.08 = 331.92/x
  3. Step 3: Cross multiply
    851.94x = 1,278.08 × 331.92
  4. Step 4: Simplify right side
    851.94x = 424,218.65
  5. Step 5: Solve for x
    x = 424,218.65/851.94
  6. Step 6: Final answer
    x = 497.94

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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.