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Finding the Fourth Proportional to 12,579.70, 18,820.95 and 8,205.70

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Solution

The fourth proportional to 12,579.70, 18,820.95 and 8,205.70 is: 12,276.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,579.70 : 18,820.95 = 8,205.70 : x
  2. Step 2: Convert to fraction form
    12,579.70/18,820.95 = 8,205.70/x
  3. Step 3: Cross multiply
    12,579.70x = 18,820.95 × 8,205.70
  4. Step 4: Simplify right side
    12,579.70x = 154,439,069.42
  5. Step 5: Solve for x
    x = 154,439,069.42/12,579.70
  6. Step 6: Final answer
    x = 12,276.85

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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.