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Finding the Fourth Proportional to 8,425.56, 12,639.90 and 2,878.60

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Solution

The fourth proportional to 8,425.56, 12,639.90 and 2,878.60 is: 4,318.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,425.56 : 12,639.90 = 2,878.60 : x
  2. Step 2: Convert to fraction form
    8,425.56/12,639.90 = 2,878.60/x
  3. Step 3: Cross multiply
    8,425.56x = 12,639.90 × 2,878.60
  4. Step 4: Simplify right side
    8,425.56x = 36,385,216.14
  5. Step 5: Solve for x
    x = 36,385,216.14/8,425.56
  6. Step 6: Final answer
    x = 4,318.43

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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.