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Finding the Fourth Proportional to 8,759.80, 13,139.70 and 3,211.30

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Solution

The fourth proportional to 8,759.80, 13,139.70 and 3,211.30 is: 4,816.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,759.80 : 13,139.70 = 3,211.30 : x
  2. Step 2: Convert to fraction form
    8,759.80/13,139.70 = 3,211.30/x
  3. Step 3: Cross multiply
    8,759.80x = 13,139.70 × 3,211.30
  4. Step 4: Simplify right side
    8,759.80x = 42,195,518.61
  5. Step 5: Solve for x
    x = 42,195,518.61/8,759.80
  6. Step 6: Final answer
    x = 4,816.95

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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.