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Finding the Fourth Proportional to 958.56, 1,438.23 and 438.81

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Solution

The fourth proportional to 958.56, 1,438.23 and 438.81 is: 658.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.56 : 1,438.23 = 438.81 : x
  2. Step 2: Convert to fraction form
    958.56/1,438.23 = 438.81/x
  3. Step 3: Cross multiply
    958.56x = 1,438.23 × 438.81
  4. Step 4: Simplify right side
    958.56x = 631,109.71
  5. Step 5: Solve for x
    x = 631,109.71/958.56
  6. Step 6: Final answer
    x = 658.39

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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.