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Finding the Fourth Proportional to 879.08, 1,318.85 and 331.42

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Solution

The fourth proportional to 879.08, 1,318.85 and 331.42 is: 497.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.08 : 1,318.85 = 331.42 : x
  2. Step 2: Convert to fraction form
    879.08/1,318.85 = 331.42/x
  3. Step 3: Cross multiply
    879.08x = 1,318.85 × 331.42
  4. Step 4: Simplify right side
    879.08x = 437,085.02
  5. Step 5: Solve for x
    x = 437,085.02/879.08
  6. Step 6: Final answer
    x = 497.21

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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.