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Finding the Fourth Proportional to 13,661.88, 18,862.12 and 11,149.99

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Solution

The fourth proportional to 13,661.88, 18,862.12 and 11,149.99 is: 15,394.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,661.88 : 18,862.12 = 11,149.99 : x
  2. Step 2: Convert to fraction form
    13,661.88/18,862.12 = 11,149.99/x
  3. Step 3: Cross multiply
    13,661.88x = 18,862.12 × 11,149.99
  4. Step 4: Simplify right side
    13,661.88x = 210,312,459.54
  5. Step 5: Solve for x
    x = 210,312,459.54/13,661.88
  6. Step 6: Final answer
    x = 15,394.11

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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.