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Finding the Fourth Proportional to 12,811.20, 19,217.10 and 4,500.78

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Solution

The fourth proportional to 12,811.20, 19,217.10 and 4,500.78 is: 6,751.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,811.20 : 19,217.10 = 4,500.78 : x
  2. Step 2: Convert to fraction form
    12,811.20/19,217.10 = 4,500.78/x
  3. Step 3: Cross multiply
    12,811.20x = 19,217.10 × 4,500.78
  4. Step 4: Simplify right side
    12,811.20x = 86,491,939.34
  5. Step 5: Solve for x
    x = 86,491,939.34/12,811.20
  6. Step 6: Final answer
    x = 6,751.28

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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.