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Finding the Fourth Proportional to 13,617.11, 18,799.49 and 8,909.60

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Solution

The fourth proportional to 13,617.11, 18,799.49 and 8,909.60 is: 12,300.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,617.11 : 18,799.49 = 8,909.60 : x
  2. Step 2: Convert to fraction form
    13,617.11/18,799.49 = 8,909.60/x
  3. Step 3: Cross multiply
    13,617.11x = 18,799.49 × 8,909.60
  4. Step 4: Simplify right side
    13,617.11x = 167,495,864.38
  5. Step 5: Solve for x
    x = 167,495,864.38/13,617.11
  6. Step 6: Final answer
    x = 12,300.40

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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.