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Finding the Fourth Proportional to 13,591.97, 18,728.16 and 12,656.96

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Solution

The fourth proportional to 13,591.97, 18,728.16 and 12,656.96 is: 17,439.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,591.97 : 18,728.16 = 12,656.96 : x
  2. Step 2: Convert to fraction form
    13,591.97/18,728.16 = 12,656.96/x
  3. Step 3: Cross multiply
    13,591.97x = 18,728.16 × 12,656.96
  4. Step 4: Simplify right side
    13,591.97x = 237,041,571.99
  5. Step 5: Solve for x
    x = 237,041,571.99/13,591.97
  6. Step 6: Final answer
    x = 17,439.82

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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.