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Finding the Fourth Proportional to 13,817.88, 18,990.09 and 12,943.08

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Solution

The fourth proportional to 13,817.88, 18,990.09 and 12,943.08 is: 17,787.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,817.88 : 18,990.09 = 12,943.08 : x
  2. Step 2: Convert to fraction form
    13,817.88/18,990.09 = 12,943.08/x
  3. Step 3: Cross multiply
    13,817.88x = 18,990.09 × 12,943.08
  4. Step 4: Simplify right side
    13,817.88x = 245,790,254.08
  5. Step 5: Solve for x
    x = 245,790,254.08/13,817.88
  6. Step 6: Final answer
    x = 17,787.84

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.