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Finding the Fourth Proportional to 13,755.25, 18,986.57 and 8,787.25

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Solution

The fourth proportional to 13,755.25, 18,986.57 and 8,787.25 is: 12,129.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,755.25 : 18,986.57 = 8,787.25 : x
  2. Step 2: Convert to fraction form
    13,755.25/18,986.57 = 8,787.25/x
  3. Step 3: Cross multiply
    13,755.25x = 18,986.57 × 8,787.25
  4. Step 4: Simplify right side
    13,755.25x = 166,839,737.23
  5. Step 5: Solve for x
    x = 166,839,737.23/13,755.25
  6. Step 6: Final answer
    x = 12,129.17

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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.