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Finding the Fourth Proportional to 12,813.68, 19,221.28 and 3,579.68

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Solution

The fourth proportional to 12,813.68, 19,221.28 and 3,579.68 is: 5,369.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,813.68 : 19,221.28 = 3,579.68 : x
  2. Step 2: Convert to fraction form
    12,813.68/19,221.28 = 3,579.68/x
  3. Step 3: Cross multiply
    12,813.68x = 19,221.28 × 3,579.68
  4. Step 4: Simplify right side
    12,813.68x = 68,806,031.59
  5. Step 5: Solve for x
    x = 68,806,031.59/12,813.68
  6. Step 6: Final answer
    x = 5,369.73

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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.