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Finding the Fourth Proportional to 682.35, 1,021.22 and 571.65

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Solution

The fourth proportional to 682.35, 1,021.22 and 571.65 is: 855.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.35 : 1,021.22 = 571.65 : x
  2. Step 2: Convert to fraction form
    682.35/1,021.22 = 571.65/x
  3. Step 3: Cross multiply
    682.35x = 1,021.22 × 571.65
  4. Step 4: Simplify right side
    682.35x = 583,780.41
  5. Step 5: Solve for x
    x = 583,780.41/682.35
  6. Step 6: Final answer
    x = 855.54

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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.