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Finding the Fourth Proportional to 682.85, 1,021.97 and 572.15

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Solution

The fourth proportional to 682.85, 1,021.97 and 572.15 is: 856.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    682.85 : 1,021.97 = 572.15 : x
  2. Step 2: Convert to fraction form
    682.85/1,021.97 = 572.15/x
  3. Step 3: Cross multiply
    682.85x = 1,021.97 × 572.15
  4. Step 4: Simplify right side
    682.85x = 584,712.16
  5. Step 5: Solve for x
    x = 584,712.16/682.85
  6. Step 6: Final answer
    x = 856.29

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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.