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Finding the Fourth Proportional to 8,612.85, 12,912.36 and 4,917.67

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Solution

The fourth proportional to 8,612.85, 12,912.36 and 4,917.67 is: 7,372.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,612.85 : 12,912.36 = 4,917.67 : x
  2. Step 2: Convert to fraction form
    8,612.85/12,912.36 = 4,917.67/x
  3. Step 3: Cross multiply
    8,612.85x = 12,912.36 × 4,917.67
  4. Step 4: Simplify right side
    8,612.85x = 63,498,762.01
  5. Step 5: Solve for x
    x = 63,498,762.01/8,612.85
  6. Step 6: Final answer
    x = 7,372.56

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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.