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Finding the Fourth Proportional to 879.50, 1,319.39 and 331.73

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Solution

The fourth proportional to 879.50, 1,319.39 and 331.73 is: 497.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    879.50 : 1,319.39 = 331.73 : x
  2. Step 2: Convert to fraction form
    879.50/1,319.39 = 331.73/x
  3. Step 3: Cross multiply
    879.50x = 1,319.39 × 331.73
  4. Step 4: Simplify right side
    879.50x = 437,672.99
  5. Step 5: Solve for x
    x = 437,672.99/879.50
  6. Step 6: Final answer
    x = 497.64

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Double scale
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1.5x scale

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.