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Finding the Fourth Proportional to 879.21, 1,318.80 and 331.43

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Solution

The fourth proportional to 879.21, 1,318.80 and 331.43 is: 497.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.21 : 1,318.80 = 331.43 : x
  2. Step 2: Convert to fraction form
    879.21/1,318.80 = 331.43/x
  3. Step 3: Cross multiply
    879.21x = 1,318.80 × 331.43
  4. Step 4: Simplify right side
    879.21x = 437,091.95
  5. Step 5: Solve for x
    x = 437,091.95/879.21
  6. Step 6: Final answer
    x = 497.14

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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.