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Finding the Fourth Proportional to 13,754.41, 18,978.16 and 8,087.09

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Solution

The fourth proportional to 13,754.41, 18,978.16 and 8,087.09 is: 11,158.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,754.41 : 18,978.16 = 8,087.09 : x
  2. Step 2: Convert to fraction form
    13,754.41/18,978.16 = 8,087.09/x
  3. Step 3: Cross multiply
    13,754.41x = 18,978.16 × 8,087.09
  4. Step 4: Simplify right side
    13,754.41x = 153,477,972.85
  5. Step 5: Solve for x
    x = 153,477,972.85/13,754.41
  6. Step 6: Final answer
    x = 11,158.46

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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.