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Finding the Fourth Proportional to 958.68, 1,438.02 and 381.72

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Solution

The fourth proportional to 958.68, 1,438.02 and 381.72 is: 572.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.68 : 1,438.02 = 381.72 : x
  2. Step 2: Convert to fraction form
    958.68/1,438.02 = 381.72/x
  3. Step 3: Cross multiply
    958.68x = 1,438.02 × 381.72
  4. Step 4: Simplify right side
    958.68x = 548,920.99
  5. Step 5: Solve for x
    x = 548,920.99/958.68
  6. Step 6: Final answer
    x = 572.58

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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.