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Finding the Fourth Proportional to 139,157.76, 192,047.36 and 78,728.64

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Solution

The fourth proportional to 139,157.76, 192,047.36 and 78,728.64 is: 108,650.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,157.76 : 192,047.36 = 78,728.64 : x
  2. Step 2: Convert to fraction form
    139,157.76/192,047.36 = 78,728.64/x
  3. Step 3: Cross multiply
    139,157.76x = 192,047.36 × 78,728.64
  4. Step 4: Simplify right side
    139,157.76x = 15,119,627,468.39
  5. Step 5: Solve for x
    x = 15,119,627,468.39/139,157.76
  6. Step 6: Final answer
    x = 108,650.98

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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.