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Finding the Fourth Proportional to 139,157.72, 192,024.96 and 78,733.88

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Solution

The fourth proportional to 139,157.72, 192,024.96 and 78,733.88 is: 108,645.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,157.72 : 192,024.96 = 78,733.88 : x
  2. Step 2: Convert to fraction form
    139,157.72/192,024.96 = 78,733.88/x
  3. Step 3: Cross multiply
    139,157.72x = 192,024.96 × 78,733.88
  4. Step 4: Simplify right side
    139,157.72x = 15,118,870,157.64
  5. Step 5: Solve for x
    x = 15,118,870,157.64/139,157.72
  6. Step 6: Final answer
    x = 108,645.57

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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.