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Finding the Fourth Proportional to 13,551.61, 18,659.68 and 11,863.57

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Solution

The fourth proportional to 13,551.61, 18,659.68 and 11,863.57 is: 16,335.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,551.61 : 18,659.68 = 11,863.57 : x
  2. Step 2: Convert to fraction form
    13,551.61/18,659.68 = 11,863.57/x
  3. Step 3: Cross multiply
    13,551.61x = 18,659.68 × 11,863.57
  4. Step 4: Simplify right side
    13,551.61x = 221,370,419.86
  5. Step 5: Solve for x
    x = 221,370,419.86/13,551.61
  6. Step 6: Final answer
    x = 16,335.36

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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.