Home / 8,538.20-12,815.40-5,257.70

Finding the Fourth Proportional to 8,538.20, 12,815.40 and 5,257.70

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Solution

The fourth proportional to 8,538.20, 12,815.40 and 5,257.70 is: 7,891.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,538.20 : 12,815.40 = 5,257.70 : x
  2. Step 2: Convert to fraction form
    8,538.20/12,815.40 = 5,257.70/x
  3. Step 3: Cross multiply
    8,538.20x = 12,815.40 × 5,257.70
  4. Step 4: Simplify right side
    8,538.20x = 67,379,528.58
  5. Step 5: Solve for x
    x = 67,379,528.58/8,538.20
  6. Step 6: Final answer
    x = 7,891.54

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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.