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Finding the Fourth Proportional to 958.76, 1,438.68 and 445.76

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Solution

The fourth proportional to 958.76, 1,438.68 and 445.76 is: 668.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    958.76 : 1,438.68 = 445.76 : x
  2. Step 2: Convert to fraction form
    958.76/1,438.68 = 445.76/x
  3. Step 3: Cross multiply
    958.76x = 1,438.68 × 445.76
  4. Step 4: Simplify right side
    958.76x = 641,306.00
  5. Step 5: Solve for x
    x = 641,306.00/958.76
  6. Step 6: Final answer
    x = 668.89

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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.