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Finding the Fourth Proportional to 8,559.80, 12,839.70 and 2,716.40

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Solution

The fourth proportional to 8,559.80, 12,839.70 and 2,716.40 is: 4,074.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,559.80 : 12,839.70 = 2,716.40 : x
  2. Step 2: Convert to fraction form
    8,559.80/12,839.70 = 2,716.40/x
  3. Step 3: Cross multiply
    8,559.80x = 12,839.70 × 2,716.40
  4. Step 4: Simplify right side
    8,559.80x = 34,877,761.08
  5. Step 5: Solve for x
    x = 34,877,761.08/8,559.80
  6. Step 6: Final answer
    x = 4,074.60

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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.