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Finding the Fourth Proportional to 958.67, 1,438.26 and 519.81

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Solution

The fourth proportional to 958.67, 1,438.26 and 519.81 is: 779.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.67 : 1,438.26 = 519.81 : x
  2. Step 2: Convert to fraction form
    958.67/1,438.26 = 519.81/x
  3. Step 3: Cross multiply
    958.67x = 1,438.26 × 519.81
  4. Step 4: Simplify right side
    958.67x = 747,621.93
  5. Step 5: Solve for x
    x = 747,621.93/958.67
  6. Step 6: Final answer
    x = 779.85

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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.