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Finding the Fourth Proportional to 684.72, 1,027.98 and 662.85

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Solution

The fourth proportional to 684.72, 1,027.98 and 662.85 is: 995.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.72 : 1,027.98 = 662.85 : x
  2. Step 2: Convert to fraction form
    684.72/1,027.98 = 662.85/x
  3. Step 3: Cross multiply
    684.72x = 1,027.98 × 662.85
  4. Step 4: Simplify right side
    684.72x = 681,396.54
  5. Step 5: Solve for x
    x = 681,396.54/684.72
  6. Step 6: Final answer
    x = 995.15

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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.