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Finding the Fourth Proportional to 8,586.88, 12,870.08 and 3,960

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Solution

The fourth proportional to 8,586.88, 12,870.08 and 3,960 is: 5,935.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,586.88 : 12,870.08 = 3,960 : x
  2. Step 2: Convert to fraction form
    8,586.88/12,870.08 = 3,960/x
  3. Step 3: Cross multiply
    8,586.88x = 12,870.08 × 3,960
  4. Step 4: Simplify right side
    8,586.88x = 50,965,516.80
  5. Step 5: Solve for x
    x = 50,965,516.80/8,586.88
  6. Step 6: Final answer
    x = 5,935.28

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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.