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Finding the Fourth Proportional to 958.88, 1,438.38 and 381.75

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Solution

The fourth proportional to 958.88, 1,438.38 and 381.75 is: 572.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.88 : 1,438.38 = 381.75 : x
  2. Step 2: Convert to fraction form
    958.88/1,438.38 = 381.75/x
  3. Step 3: Cross multiply
    958.88x = 1,438.38 × 381.75
  4. Step 4: Simplify right side
    958.88x = 549,101.57
  5. Step 5: Solve for x
    x = 549,101.57/958.88
  6. Step 6: Final answer
    x = 572.65

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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.