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Finding the Fourth Proportional to 13,608.88, 18,817.20 and 11,859.28

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Solution

The fourth proportional to 13,608.88, 18,817.20 and 11,859.28 is: 16,398.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,608.88 : 18,817.20 = 11,859.28 : x
  2. Step 2: Convert to fraction form
    13,608.88/18,817.20 = 11,859.28/x
  3. Step 3: Cross multiply
    13,608.88x = 18,817.20 × 11,859.28
  4. Step 4: Simplify right side
    13,608.88x = 223,158,443.62
  5. Step 5: Solve for x
    x = 223,158,443.62/13,608.88
  6. Step 6: Final answer
    x = 16,398.00

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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.