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Finding the Fourth Proportional to 8,615.61, 12,912.98 and 3,929.20

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Solution

The fourth proportional to 8,615.61, 12,912.98 and 3,929.20 is: 5,889.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,615.61 : 12,912.98 = 3,929.20 : x
  2. Step 2: Convert to fraction form
    8,615.61/12,912.98 = 3,929.20/x
  3. Step 3: Cross multiply
    8,615.61x = 12,912.98 × 3,929.20
  4. Step 4: Simplify right side
    8,615.61x = 50,737,658.56
  5. Step 5: Solve for x
    x = 50,737,658.56/8,615.61
  6. Step 6: Final answer
    x = 5,889.04

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1.5x scale

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.