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Finding the Fourth Proportional to 78,157.98, 117,236.97 and 18,993.69

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Solution

The fourth proportional to 78,157.98, 117,236.97 and 18,993.69 is: 28,490.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,157.98 : 117,236.97 = 18,993.69 : x
  2. Step 2: Convert to fraction form
    78,157.98/117,236.97 = 18,993.69/x
  3. Step 3: Cross multiply
    78,157.98x = 117,236.97 × 18,993.69
  4. Step 4: Simplify right side
    78,157.98x = 2,226,762,664.72
  5. Step 5: Solve for x
    x = 2,226,762,664.72/78,157.98
  6. Step 6: Final answer
    x = 28,490.54

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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.