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Finding the Fourth Proportional to 958.60, 1,438.24 and 519.80

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Solution

The fourth proportional to 958.60, 1,438.24 and 519.80 is: 779.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.60 : 1,438.24 = 519.80 : x
  2. Step 2: Convert to fraction form
    958.60/1,438.24 = 519.80/x
  3. Step 3: Cross multiply
    958.60x = 1,438.24 × 519.80
  4. Step 4: Simplify right side
    958.60x = 747,597.15
  5. Step 5: Solve for x
    x = 747,597.15/958.60
  6. Step 6: Final answer
    x = 779.88

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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.