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Finding the Fourth Proportional to 13,689.94, 18,768.95 and 13,440.82

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Solution

The fourth proportional to 13,689.94, 18,768.95 and 13,440.82 is: 18,427.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,689.94 : 18,768.95 = 13,440.82 : x
  2. Step 2: Convert to fraction form
    13,689.94/18,768.95 = 13,440.82/x
  3. Step 3: Cross multiply
    13,689.94x = 18,768.95 × 13,440.82
  4. Step 4: Simplify right side
    13,689.94x = 252,270,078.54
  5. Step 5: Solve for x
    x = 252,270,078.54/13,689.94
  6. Step 6: Final answer
    x = 18,427.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.