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Finding the Fourth Proportional to 717.85, 991 and 423.42

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Solution

The fourth proportional to 717.85, 991 and 423.42 is: 584.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    717.85 : 991 = 423.42 : x
  2. Step 2: Convert to fraction form
    717.85/991 = 423.42/x
  3. Step 3: Cross multiply
    717.85x = 991 × 423.42
  4. Step 4: Simplify right side
    717.85x = 419,609.22
  5. Step 5: Solve for x
    x = 419,609.22/717.85
  6. Step 6: Final answer
    x = 584.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.