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Finding the Fourth Proportional to 958.57, 1,438.09 and 403.31

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Solution

The fourth proportional to 958.57, 1,438.09 and 403.31 is: 605.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.57 : 1,438.09 = 403.31 : x
  2. Step 2: Convert to fraction form
    958.57/1,438.09 = 403.31/x
  3. Step 3: Cross multiply
    958.57x = 1,438.09 × 403.31
  4. Step 4: Simplify right side
    958.57x = 579,998.66
  5. Step 5: Solve for x
    x = 579,998.66/958.57
  6. Step 6: Final answer
    x = 605.07

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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.