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Finding the Fourth Proportional to 78,163.80, 117,244.06 and 18,999.78

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Solution

The fourth proportional to 78,163.80, 117,244.06 and 18,999.78 is: 28,499.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,163.80 : 117,244.06 = 18,999.78 : x
  2. Step 2: Convert to fraction form
    78,163.80/117,244.06 = 18,999.78/x
  3. Step 3: Cross multiply
    78,163.80x = 117,244.06 × 18,999.78
  4. Step 4: Simplify right side
    78,163.80x = 2,227,611,346.31
  5. Step 5: Solve for x
    x = 2,227,611,346.31/78,163.80
  6. Step 6: Final answer
    x = 28,499.27

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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.