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Finding the Fourth Proportional to 851.99, 1,278 and 331.86

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Solution

The fourth proportional to 851.99, 1,278 and 331.86 is: 497.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    851.99 : 1,278 = 331.86 : x
  2. Step 2: Convert to fraction form
    851.99/1,278 = 331.86/x
  3. Step 3: Cross multiply
    851.99x = 1,278 × 331.86
  4. Step 4: Simplify right side
    851.99x = 424,121.87
  5. Step 5: Solve for x
    x = 424,121.87/851.99
  6. Step 6: Final answer
    x = 497.80

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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.