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Finding the Fourth Proportional to 13,137.36, 18,123.84 and 8,655.36

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Solution

The fourth proportional to 13,137.36, 18,123.84 and 8,655.36 is: 11,940.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,137.36 : 18,123.84 = 8,655.36 : x
  2. Step 2: Convert to fraction form
    13,137.36/18,123.84 = 8,655.36/x
  3. Step 3: Cross multiply
    13,137.36x = 18,123.84 × 8,655.36
  4. Step 4: Simplify right side
    13,137.36x = 156,868,359.78
  5. Step 5: Solve for x
    x = 156,868,359.78/13,137.36
  6. Step 6: Final answer
    x = 11,940.63

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.